Numericals of Light Class 10

Last updated on July 13th, 2023 at 12:32 pm

In this post, you will find a set of Numericals of Light for Class 10. The solutions are given as well that would help you to get a good grasp on this important chapter of class 10 physics.

Numericals of Light Class 10 | Light Numericals Class 10

Here, you will find numerical problems based on lenses and mirrors.

For your quick reference: Lens sign convention details

Question 1) A convex mirror used for rear-view on an automobile has a radius of curvature of 3.00 m. If a bus is located at 5.00 m from this mirror, find the position, nature, and size of the image.

Solution:

Question 2) An object, 4.0 cm in size, is placed at 25.0 cm in front of a concave mirror of focal length 15.0 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Find the nature and the size of the image.

Solution:

Question 3) A concave lens has focal length of 15 cm. At what distance should the object from the lens be placed so that it forms an image at 10 cm from the lens? Also, find the magnification produced by the lens.

Solution:

Question 4) A 2.0 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 10 cm. The distance of the object from the lens is 15 cm. Find the nature, position and size of the image. Also find its magnification.

Solution:

Question 5) A security mirror used in a big showroom has a radius of curvature of 5 m. If a customer is standing at a distance of 20 m from the cash counter, find the position, nature, and size of the image formed in the security mirror.

Solution:

Given the radius of curvature of the mirror,
R = 5 m
∴ Focal length, f = R/2 = 2.5 m (convex mirror) and u = -20 m

Thus, the image is formed 2.22 m behind the mirror. The image is diminished, virtual and erect.

Question 6) calculate the focal length and nature of a spherical mirror which forms a 1/3 times magnified virtual image of an object placed 18 cm in front of it.

Solution: