Light reflection and refraction Worksheet-4

Light reflection and refraction Worksheet-4

1. The image formed by a concave mirror is virtual, erect and magnified the position of the object is

A. At F                                             B. At C

C. At infinity                                  D. Between P and F

2. The image formed by a spherical mirror is virtual the mirror is

A. Convex                                      B. Concave

C. Either convex or concave      D. Cannot say

3. The image formed by a spherical mirror is virtual, erect and smaller the size whatever be the position of the object. The mirror is

A. Convex                                      B. Concave

C. Either convex or concave      D. Cannot say

4. Linear magnification of a concave mirror may be

A. Less than 1                                B. More than 1

C. More or less than 1                  D. Infinity

5. Linear magnification of a convex mirror is always

A. Equal to 1                                  B. Less than 1

C. More than 1                              D. Infinity

6. The mirror used by a dental surgeon is

A. Plane                                          B. Convex

C. Concave                                     D. Any one of these

7. Frequency (v) and wavelength (λ) of light are related as where c is velocity of light.

A. c = vλ             B. λ = cv             C. v = cλ             D. λ = (v/c)

8. When light goes from one medium to another, the characteristic that remains unaffected is

A. Speed                                         B. Direction

C. Wavelength                              D. Frequency

9. The refractive index of diamond is

A. 1.4                  B. 1.33                C. 2.42               D. 1.8

10. Light travels fastest in

A. Vacuum        B. Air                  C. Glass              D. Diamond

Answer Key:

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