Physics

Question 1

1A camera lens forms an image on the sensor that is

Easy

A. magnified and upright B. virtual and upright C. virtual and inverted D. real, inverted and diminished

Question 2

2The power of a lens of focal length 0.5 m is

Easy

A. 2 D B. 5 D C. 0.5 D D. 50 D

Question 3

3Laser light is

Easy

A. monochromatic and coherent B. made of sound C. always invisible D. white and scattered

Question 4

4An object is 30 cm from a converging lens of focal length 10 cm. The image distance is

Medium

A. 20 cm B. 30 cm C. 7.5 cm D. 15 cm

Question 5

5The magnification of an image formed 60 cm from a lens when the object is 20 cm away is

Hard

A. 80 B. 3 C. 40 D. 0.33

Question 6

6Two thin lenses of focal lengths 20 cm and 30 cm in contact have a combined focal length of

Hard

A. 50 cm B. 12 cm C. 10 cm D. 25 cm

Question 7

7A magnifying glass is a

Easy

A. converging (convex) lens with the object inside its focal length B. plane mirror C. diverging lens D. prism

Question 8

8A lens of power −2.5 D is

Hard

A. converging with focal length 40 cm B. converging with focal length 2.5 m C. diverging with focal length 40 cm D. diverging with focal length 25 cm

Question 9

9A converging lens forms a real image of an object at twice its focal length. The image is

Medium

A. diminished and upright B. the same size and inverted C. magnified and upright D. virtual

Question 10

10Laser light differs from ordinary light because it is

Easy

A. unable to travel in air B. made of many colours C. always invisible D. monochromatic and coherent