Q 31 :    

A convex lens of focal length 30 cm is placed in contact with a concave lens of focal length 20 cm. An object is placed at 20 cm to the left of this lens system. The distance of the image from the lens in cm is          [2025]

• 30

   

• 45

   

• $\frac{60}{7}$

   

• 15

   

Q 32 :    

Light from a point source in air falls on a spherical glass surface (refractive index, $\mu$ = 1.5 and radius of curvature = 50 cm). The image is formed at a distance of 200 cm from the glass surface inside the glass. The magnitude of distance of the light source from the glass surface is ________ m.           [2025]