NCERT Solutions · Class 10 Science Light - Reflection and Refraction

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

An object is placed at a distance of $\displaystyle 10$ cm from a convex mirror of focal length $\displaystyle 15$ cm. Find the position and nature of the image.

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

An object $\displaystyle 5.0$ cm in length is placed at a distance of $\displaystyle 20$ cm in front of a convex mirror of radius of curvature $\displaystyle 30$ cm. Find the position of the image, its nature and size.

An object of size $\displaystyle 7.0$ cm is placed at $\displaystyle 27$ cm in front of a concave mirror of focal length $\displaystyle 18$ cm. At what distance from the mirror should a screen be placed, so that a sharp focussed image can be obtained? Find the size and the nature of the image.

Find the focal length of a lens of power – $\displaystyle 2.0$ D. What type of lens is this?

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