List of top Science Questions on Refraction of Light asked in CBSE Class X

A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram.

A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?

Find the focal length of a lens of power −2.0 D. What type of lens is this?

The magnification produced by a plane mirror is +1. What does this mean?

An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and the nature of the image formed.

One-half of a convex lens is covered with a black paper. Will this lens produce a complete image of the object? Verify your answer experimentally. Explain your observations.

Which of the following lenses would you prefer to use while reading small letters found in a dictionary?

Where should an object be placed in front of a convex lens to get a real image of the size of the object?

The refractive index of diamond is 2.42. What is the meaning of this statement?

You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table.

Find out, from Table, the medium having highest optical density. Also find the medium with lowest optical density.

Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 × 10⁸ m s⁻¹.

A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?