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

A convex lens has focal length 20 cm. An object is placed at a distance of 40 cm from the lens. What is the position of the image formed?
Find the focal length of a lens in a compound lens system.
A concave mirror produces an image that is real, inverted, and diminished. What is the position of the object in relation to the mirror?
A radio wave travels in a medium with refractive index 1.5. What is the speed of light in this medium if the speed of light in vacuum is \(3 \times 10^8 \, \text{m/s}\)?