Light reflection and refraction Worksheet-27

Light reflection and refraction Worksheet-27

 

  1. To produce an image by a convex lens, in the position shown (see figure) the object has to be placed

A. Between Y and O                     B. At Y

C. Between X and Y                     D. At X

 

  1. Light rays P and Q fall on optical component X and come out as R and S.

The optical component is a :

A. Concave lens                             B. Convex lens

C. Convex mirror                         D. Prism

 

  1. The term refraction of light is:

A. The bending of light rays when they enter from one medium to another medium

B. Splitting of white light into seven colours when it passes through prism

C. Bending of light round corners of obstacles and apertures

D. Coming back of light round corners of obstacles and apertures

 

  1. Light travels from diamond to glass, glass to water and water to air. In this context when can total internal reflection take place?

(i) When light travels from diamond to glass.

(ii) When light travels from glass to water.

(iii) When light travels from water to air.

A. When light travels from glass to water. and When light travels from water to air.

B. When light travels from diamond to glass. and When light travels from glass to water.

C. When light travels from diamond to glass., When light travels from glass to water.and When light travels from water to air.

D. When light travels from diamond to glass. and When light travels from water to air.

 

  1. A person looks into the mirror by placing it close to his face. The image of his face was erect, laterally inverted and of the same size. Then, the mirror must be :

A. Plane             B. Concave        C. Convex          D. Plane or concave

 

  1. The focal length of the concave mirror in the experiment set up shown below, is

A. 10.2 cm         B. 11.0 cm                   C. 11.4 cm                   D. 12.2 cm

 

  1. If a cardboard is placed (close to the mirror) to cover half the size of the concave mirror, the image formed will be

A. complete                                    B. brighter

C. dimmer                                      D. complete but dimmer

 

  1. In the experiment to trace the path of a ray of light through a rectangular glass slab using pins P1, P2, P3 and P4 four students did the following

1. looked heads of P1 and P2 while placing P3 and heads P1, P2 and P3 while placing P4

2. looked heads of P1 and P2 while placing P3 and feet of P1, P2 and P3 while placing P4

3. looked heads of P1 and P2 while placing P3 and feet of all the pins while placing P4

4. looked feet of P1 and P2 while placing P3 and heads of all the pins while placing P4

A. 1. looked heads of P1 and P2 while placing P3 and heads P1, P2 and P3 while placing P4

B. 2. looked heads of P1 and P2 while placing P3 and feet of P1, P2 and P3 while placing P4

C. 3. looked heads of P1 and P2 while placing P3 and feet of all the pins while placing P4

D. 4. looked feet of P1 and P2 while placing P3 and heads of all the pins while placing P4

 

  1. Parallel rays, from the top of a distant tree, incident on a concave mirror, form an image on the screen. The diagram correctly showing image of the tree on the screen is

A.

B.

C.

D.

 

  1. A student performs experiment on finding the focal length of a convex lens by keeping a lighted candle on one end of laboratory table, a screen on its other end and the lens between them as shown in the figure. The positions of the lens are adjusted to get a sharp image of the candle flame on the screen. If now the candle flame were to be replaced by a distant lamp on a far away electric pole, the student would be able to get a sharp image of this distant lamp on the screen by moving

A. the screen away from the lens

B. the lens away from the lens

C. the screen towards the lens

D. Both lens and screen towards the distant lamp

 

Answer Key:

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