Question

tell the correct answer​

Answer 1

Explanation:

7.(b)Refractive index =1.5=u

Angle of incidence =30°=i

Let angle of refraction be r.

By Snell's law,

Sin i/Sin r =u

Sin 30/Sin r =1.5

1/2Sin r=3/2

Sin r=1/3

r = Sin inverse (1/3)...

(a)Focal length =f =+10 cm

Object distance=u=-20 cm

Let image distance be v.

Then,

1/f =1/v - 1/u

1/v= 1/f - 1/u

1/v =1/20

v= 20 cm....

Hope it will help you....