Practise Class 8 Science Chapter 10 – Light: Mirrors and Lenses with this easy NCERT Curiosity worksheet. Includes important questions and revision exercises to strengthen understanding of light, mirrors and lenses and prepare effectively for class tests and exams.
Chapter 10 Worksheet
Light: Mirrors and Lenses
Instructions:
- Read each question carefully.
- Choose the correct answer where options are given.
- Draw neat ray diagrams wherever required.
- Show all steps in numerical questions.
Section A – Multiple Choice Questions
1. Which mirror is used as a side-view mirror in vehicles?
2. A mirror whose reflecting surface curves inward is called a:
- Convex mirror
- Concave mirror
- Plane mirror
- Flat mirror
3. Which mirror provides a wider field of view?
- Convex mirror
- Plane mirror
- Concave mirror
- None of these
4. Which lens is thicker at the centre?
- Concave lens
- Convex lens
- Plane glass
- None
5. A convex lens is also called a:
- Diverging lens
- Converging lens
- Plane lens
- Reflecting lens
6. A concave lens generally forms an image that is:
- Inverted and enlarged
- Erect and diminished
- Inverted and same size
- Erect and enlarged
7. The angle between the incident ray and the normal is called:
- Angle of reflection
- Angle of incidence
- Angle of deviation
- Angle of refraction
8. Which device uses a convex lens to make small objects appear larger?
- Magnifying glass
- Convex mirror
- Plane mirror
- Periscope only
9. Which mirror can concentrate parallel rays of light?
- Convex mirror
- Plane mirror
- Concave mirror
- None
10. If the angle of incidence is 35°, the angle of reflection is:
- 70°
- 55°
- 35°
- 0°
Section B – Fill in the Blanks
1. A mirror with a reflecting surface curved inward is called a .
2. A mirror with a reflecting surface curved outward is called a .
3. The ray that falls on a mirror is called the .
4. The ray that comes back after reflection is called the .
5. The line drawn perpendicular to the mirror at the point of incidence is called the .
6. A convex mirror always forms an and diminished image.
7. A concave lens is a lens.
8. A convex lens is a lens.
Section C – True or False
1. A convex mirror always forms an erect image.
2. A concave mirror always forms a diminished image.
3. A convex lens can converge light.
4. A concave lens converges parallel rays.
5. The angle of incidence is always equal to the angle of reflection.
6. The normal is parallel to the mirror at the point of incidence.
7. Convex mirrors are useful where a wide field of view is required.
Section D – Short Answer Questions
1. What is a spherical mirror?
2. Write two differences between concave and convex mirrors.
3. What is meant by lateral inversion?
4. Why are convex mirrors used as vehicle side-view mirrors?
5. What is an incident ray?
6. What is a normal?
7. State the two laws of reflection.
8. Why is a convex lens called a converging lens?
9. Why is a concave lens called a diverging lens?
10. Name any four devices in which lenses are used.
Section E – Complete the Comparison
| Feature | Concave Mirror | Convex Mirror |
|---|---|---|
| Reflecting surface | ||
| Effect on parallel rays | ||
| Image size | ||
| Image orientation | ||
| One common use |
| Feature | Convex Lens | Concave Lens |
|---|---|---|
| Thickness | ||
| Effect on parallel rays | ||
| Image generally seen through it | ||
| Another name |
Section F – Numerical Questions on Reflection
Angle of incidence = Angle of reflection
i = r
i = r
1. A ray of light falls on a mirror at an angle of incidence of 25°. Find the angle of reflection.
2. The angle between an incident ray and the normal is 55°. What is the angle between the reflected ray and the normal?
3. A ray falls normally on a plane mirror. Find the angle of incidence and angle of reflection.
4. If the angle of reflection is 72°, find the angle of incidence.
5. The angle of incidence is 0°. What will be the direction of the reflected ray?
Section G – Give Reasons
1. Convex mirrors are used at sharp road bends.
2. Dentists use concave mirrors for examining teeth.
3. A concave mirror can be used as a reflector in a torch.
4. A convex lens can be used as a magnifying glass.
5. A concave lens cannot be used as a magnifying glass for producing an enlarged image.
6. We should never look at the Sun through a convex lens.
Section H – Application-Based Questions
1. A driver wants to see a large area of the road behind the vehicle. Which mirror should be used? Why?
2. A dentist wants to see a larger image of a tooth. Which type of mirror would be useful?
3. A student wants to concentrate sunlight on a small piece of paper. Should the student use a concave mirror or a convex mirror? Explain.
4. A shopkeeper wants to observe a large area of a shop using one mirror. Which mirror would be suitable?
5. A student reads tiny letters using a magnifying glass. Which type of lens is present in it?
6. A camera needs lenses to form images. What type of optical device is used in a camera?
Section I – Think and Reason
1. A convex mirror forms a smaller image. Why can this be useful even though the image is not the actual size?
2. Why does a concave mirror sometimes form an erect image and sometimes an inverted image?
3. If two rays fall on a plane mirror at different angles, will their reflected rays also have different directions? Explain.
4. Why does a convex lens bring parallel rays closer together?
5. Why does a concave lens make parallel rays spread out?
Section J – Match the Following
| Column A | Column B |
|---|---|
| 1. Concave mirror | a. Always erect and diminished image |
| 2. Convex mirror | b. Converging lens |
| 3. Convex lens | c. Converges reflected rays |
| 4. Concave lens | d. Diverging lens |
| 5. Normal | e. Perpendicular to the mirror |
Section K – Assertion and Reason
1.
Assertion: A convex mirror is useful for observing traffic behind a vehicle.
Reason: It provides a wider field of view.
- Both Assertion and Reason are correct and Reason explains Assertion.
- Both are correct but Reason does not explain Assertion.
- Assertion is correct but Reason is incorrect.
- Both are incorrect.
2.
Assertion: A convex lens can concentrate sunlight.
Reason: A convex lens converges parallel rays of light.
- Both Assertion and Reason are correct and Reason explains Assertion.
- Both are correct but Reason does not explain Assertion.
- Assertion is correct but Reason is incorrect.
- Both are incorrect.
Section L – Draw and Label
1. Draw a concave mirror and show its reflecting surface.
2. Draw a convex mirror and show its reflecting surface.
3. Draw a convex lens and a concave lens side by side.
4. Draw an incident ray, reflected ray and normal at the point of incidence.
5. Draw parallel rays falling on a concave mirror and show that they converge after reflection.
6. Draw parallel rays falling on a convex lens and show that they converge after passing through the lens.
Section M – Observe and Answer
1. You look at your face in the outer side of a shiny spoon. What type of mirror-like surface is it?
2. You look at your face in the inner side of a spoon while holding it close. What happens to the image?
3. Move a magnifying glass slowly away from a book. How does the appearance of the letters change?
4. Look at a convex mirror and a plane mirror from the same distance. Which one shows a wider area?
Section N – Challenge Corner
1. A light ray makes an angle of 30° with the mirror surface. Find the angle of incidence.
2. A ray has an angle of incidence of 48°. Find the angle between the incident ray and reflected ray.
3. A student says, “Every curved mirror makes enlarged images.” Is this statement correct? Explain.
4. A student says, “A concave lens and convex mirror both always form erect and diminished images.” Is this statement correct? Explain.
5. A solar cooker needs to concentrate sunlight. Which optical device can help and why?
Section O – One-Minute Revision
| Concept | Remember |
|---|---|
| Concave mirror | Curves inward and converges light. |
| Convex mirror | Curves outward, diverges light and gives an erect diminished image. |
| Plane mirror | Forms an erect image of the same size. |
| Incident ray | Ray falling on the mirror. |
| Reflected ray | Ray returning after reflection. |
| Normal | Perpendicular to the mirror. |
| Reflection law | i = r |
| Convex lens | Thicker in middle; converges light. |
| Concave lens | Thinner in middle; diverges light. |
| Magnifying glass | Uses a convex lens. |
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