Question

Board & Competitive Exams
(Refraction at Spherical Surfaces)
14. A point object is situated at a distance of 36 cm
from the centre of the sphere of radius 12 cm and
refractive index 1.5. Locate the position of the
image due to refraction through sphere.
(1) 24 cm from the surface
(2) 36 cm from the centre
(3) 24 cm from the centre
(4) Both (1) & (2)​

Answer 1

Answer:

4 option

Explanation:

µ1 =1

µ2= 1.5

u= -24 cm

R=+12cm

µ2/v - µ1/u = µ2-µ1/R

1.5/v - 1/-24 = 1.5 -1/+12

v = infinity become s parallel to the principal axis.

Now,

µ2/v - µ1/u =µ2- µ1/R

1/v - 1.5/ ∞ = 1-1.5/ -12

v= 24 cm

Final images is at 24cm from the surface and from centre of sphere.