List of top Physics Questions on Ray optics and optical instruments asked in MHT CET

The working of an optical fiber is based on which phenomenon?
A lens has focal length $ f = 20 \, \text{cm} $. What is the power of the lens?
An object is placed at a distance of 10 cm from a concave mirror of focal length 15 cm. What is the image distance?
A convex lens has a focal length of 20 cm. An object is placed 30 cm in front of the lens. What is the image distance from the lens?
A light ray passes from air (refractive index = 1) into water (refractive index = 1.33). If the angle of incidence is 30°, what is the angle of refraction in water?
A concave mirror has a focal length of 15 cm. An object is placed 30 cm from the mirror. What is the image distance?