Refraction & Lenses Mock Tests

A converging lens of focal length 10 cm forms an image of an object placed at 15 cm from the lens. The image distance is:

A thin convex lens of focal length 0.5 m has a power of:

The critical angle for total internal reflection at a glass-air interface is 42°. A light ray travelling in glass and incident on the interface at an angle of 35° will:

A convex lens of focal length 20 cm and a concave lens of focal length 10 cm are placed in contact. The power of the combination is:

A convex lens of focal length f and refractive index μ is immersed in a liquid of refractive index μ_L < μ. The new focal length will be:

A convex lens of focal length 20 cm is in contact with a concave lens of focal length 10 cm. The combination will behave as a:

A convex lens of focal length 20 cm is in contact with a concave lens of focal length 40 cm. The combination acts as:

The critical angle for total internal reflection in a medium is 30°. The refractive index of the medium is: