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Q1)            An object is places at distance

a.       10cm

b.      5 cm

in front of a convex mirror having a radius of curvature 15 cm. Calculate the position, nature and magnification of the image in each case.

Q2)            A ray of light passes from air to glass. If the refractive index of air with respect to glass is 0.67 and the incident ray is observed to be at 30 degrees, what is the angle of emergence?

Q3)            A ray of light enters from vaccum to glass. The RI of glass wrt vaccum is 1.5. What is the velocity of ray of light in glass?

Q4)            Which of the following is correct?

a.       The speed of light is grater in rarer medium than a denser medium

b.      The speed of light is grater in denser medium than a rarer medium

Q5)            In abut A.D. 150 , Claudius Ptolemy gave the following measured values for the angle of incidence theta1 and the angle of refraction theta2 for a light beam passing from air to water:-

Theta1

(in degrees)

Theta2(in degrees)

Theta1

(in degrees)

Theta2(in degrees)

10

8

50

35

20

15degrees 30 min

60

40 degrees 30 min

30

22 degrees 30 min.

70

45 degrees 30 min

40

29

80

50

           

a.       Are the values consistent with the laws of refraction?

b.      If so, what is the index of refraction? These data are interesting as perhaps the oldest recorded physical measurements.

Q6)            The figure shows two rays of light incident on the layers of plastics having different refracting indices. The refracting indices are given in the figure. Te rays come out at right in air.    

a.       What is the angle of emergence of ray1

b.      What is the angle of emergence of ray 2.

Copyright@Kedar Soni