# ICSE Worksheet for Chapter - 3 Light Class 8

## Find ICSE Worksheet for chapter-3 Light class 8

1. CLASS-8
2. BOARD: ICSE
3. PHYSICS Worksheet - 3
4. TOPIC: Light
5. For other  ICSE Worksheet for class 8 Science check out main page of Physics Wallah.

SUMMARY

• Lenses, Terms associated with lenses, Rays diagrams using concave and convex lens
• Uses of lens – Optical instruments, Magnifying glass – simple microscope, Compound Microscope
• Telescope, Photographic Camera, Defects of vision- Myopia, Hypermetropia

#### SECTION I – OBJECTIVE

1. Lateral shift varies inversely to: A. Wavelength B. Refractive index C. Incident angle D. None of these
2. The twinkling of stars is due to the effect of A. Refraction B. Reflection C. Absorption D. ALL of these
3. The radius of curvature is …………the focal length of lens. A. Half B. Twice C. Thrice D. Same
4. The concave lens is also called as ………..lens.
1. Converging
2. Diverging
3. Both a and b
4. NOT
5. Image formed in a concave lens is:
1. Real and of same size
2. Real and enlarged
3. Virtual and diminished
4. NOT
6. For a convex lens, a real, inverted and same size image is formed when the object is placed at
1. F
2. Between F & 2F
3. 2F
4. Infinity
7. The lens used in a photographic camera is
1. Concave
2. Convex
3. Plano concave
4. NOT
8. The spectacles used to correct myopia is
1. Concave lens
2. Convex lens
3. Cylindrical lens
4. NOT
9. Compound microscope is used to observe
1. Tall objects
2. Minute objects
3. Both (A) & (B)
4. NOT
10. A telescope is used to see
1. Tall objects
2. minute objects
3. Both (A) & (B)
4. Distant objects

#### SECTION II - SUBJECTIVE

1. Explain the working of a telescope with a neat and labeled diagram.
2. Define the following:
1. Optical centre
2. Centre of curvature
3. Focal length
3. Explain the following:
1. Myopia
2. Hypermetropia
4. Define lens and state its types.
5. Draw the cases where the image formed is enlarged in case of convex lens.
6. Distinguish between real and virtual image.

### Solutions: to worksheet-3 Topic- Light

#### Objective Problems:

 1. (A) 2. (A) 3. (B) 4. (B) 5. (C) 6. (C) 7. (B) 8. (A) 9. (B) 10. (D)