# Light reflection and refraction Worksheet-31

Light reflection and refraction Worksheet-31

1. On covering a portion of a lens with a black sheet

A. Full image is formed

B. Full image of reduced brightness is formed

C. Full image of increased brightness is formed

D. Size depending on the coverage area

1. A lens of focal length f is cut into two equal parts without affecting its curvature. The two pieces will have equal focal length of

A. f                      B. 2f                    C. f/2                  D. f/3

1. A convex lens of focal length f is cut into two equal parts with one plane surface. The new focal length of one part is

A. f                      B. 2f                    C. f/2                  D. f/3

1. Which of the following diagrams give a correct picture?

A. B. C. D. 1. The II medium shown with the refracted ray for the given incident ray is: A. Denser                                       B. Rarer

C. May be denser or rarer          D. Data insufficient

1. When a ray of light is made incident on a rectangular glass slab, it undergoes lateral displacement.

With increase in the thickness glass slab the lateral displacement

A. Increases                                   B. Decreases

C. Remains same                         D. Either increase or decrease

1. As incident angle is increased for a given pair of medium, the refraction angle will

A. Increase                                     B. Decrease

C. May increase or decrease      D. Always remains same

1. An observer moves towards a stationary plane mirror at a speed of 4 m/s. The speed of the image with respect of mirror is ___

A. 4 m/s towards the mirror     B. 8 m/s towards the mirror

C. 4 m/s away the mirror           D. Data insufficient

1. An object is placed 40 cm from a concave mirror of focal length 20 cm.

The image formed is

A. Real, inverted and same in size

B. Real, inverted and smaller

C. Virtual, erect and larger

D. Virtual, erect and smaller

1. Which of the following statements is NOT correct:

A. The magnification produced by a convex mirror is always less than one

B. A virtual, erect, same-sized image can be obtained using a plane mirror

C. A virtual, erect, magnified image can be formed using a concave mirror

D. A real, inverted, same-sized image can be formed using a convex mirror