Question

Region I and II are separated by a spherical surface of a radius of 25 cm. An object is kept in the region I at a distance of 40 cm from the surface. The distance of the image from the surface is ______.

 

विकल्प

• 55.44 cm

• 9.52 cm

• 37.58 cm

• 18.23 cm

Answer 1

Region I and II are separated by a spherical surface of a radius of 25 cm. An object is kept in the region I at a distance of 40 cm from the surface. The distance of the image from the surface is 37.58 cm.

Explanation:

Radius (R) = 25 cm

Refraction on a sphere-shaped surface,

`mu_2/v - mu_1/u = (mu_2 - mu_1)/R`

`1.4/v - 1.25/(-40) = (1.4 - 1.25)/(-25)`

ν = -37.58 cm

where the negative signs indicate a real image.