# Light reflection and refraction Worksheet-25

Light reflection and refraction Worksheet-25

1. If ƒ is focal length and R is radius of curvature of a spherical mirror, then

A. R = ƒ              B. R = 2ƒ           C. R = 3ƒ           D. R = 4ƒ

1. The image formed by a concave mirror is real, inverted and of same size as that of the object. The position of the object is

A. at centre of curvature

B. at focal point

C. between centre of curvature and focal point

D. beyond centre of curvature

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

A. at focal point

B. at centre of curvature

C. between pole and focal point

D. at infinity

1. The image formed by a spherical mirror is virtual. The mirror is

A. convex                                        B. concave

C. either convex or concave       D. cannot say

1. The image formed by a spherical mirror is virtual, erect and diminished in size. This is observed for any position of the object. The mirror is

A. convex                                        B. concave

C. either convex or concave       D. cannot say

1. Linear magnification of a concave mirror may be

A. less than 1                                  B. more than 1

C. more or less than 1                  D. infinity

1. Linear magnification of a convex mirror is always

A. equal to 1                                   B. less than 1

C. more than 1                               D. infinity

1. The mirror used by a dental surgeon is

A. plane                                          B. convex

C. concave                                      D. any one of the above

1. Frequency (v) and wavelength (λ) of light are related as

A. c = vλ             B. λ = cv              C. v = cλ             D. 1. When light goes from one medium to another, which characteristic property of light that remains unaffected is

A. speed             B. direction       C. wavelength   D. frequency