Home
Class 12
PHYSICS
a. Figure (a) shows the optical axis o...

a. Figure (a) shows the optical axis of a lens, the point source of light A, and its virtual image `A^(')` . Trace the rays to find the position of the lens and of its focuses. What type of lens is it?

b. Solve the problem similar to the previous one using Figure.

Text Solution

Verified by Experts

a. The paths of the rays are shown in the following figure. First, draw the ray `A A^(')` until it intersects with the principal optial axis and then find the center of the lens C. Since the virtual image is magnified, the lens is convex.
Draw the ray AB parallel to the principal optical axis. It is refracted by the lens so that it passes through its focus and its continuation passes through the virtual image.
The ray `A^(')B` intersects the principal optical axis at point F, the focus of the lens.

b. The paths of the rays are shown in the following figure.
Promotional Banner

Topper's Solved these Questions

  • GEOMETRICAL OPTICS

    CENGAGE PHYSICS|Exercise Exercise1.7|21 Videos

  • GEOMETRICAL OPTICS

    CENGAGE PHYSICS|Exercise Subjective|26 Videos

  • GEOMETRICAL OPTICS

    CENGAGE PHYSICS|Exercise Exercise1.5|22 Videos

  • FRICTION

    CENGAGE PHYSICS|Exercise QUESTION BANK|1 Videos

  • GRAVITATION

    CENGAGE PHYSICS|Exercise Question Bank|39 Videos

Similar Questions

Explore conceptually related problems

Given an optical axis MN and the positons of a real object AB and its image A 'B' , detormine diagramatically the positon of the lens (its optical centre O ) and its foci, it it a converging or diverging lens? Is the image real or virtual?

A lens placed at a distance of 20cm from a object produces of virtual Image 2//3 the size of the object.Find the position of the image,kind of lens and its focal length.

A glass wedge with a small angle of refraction theta is placed at a certain distance from a converging lens with a focal length f ,one surface of the wedge being perpendicular to the optical axis of the lens. A point sources S of light is on the other side of the lens at its focus. The rays reflected from the wedge (not from base) produce, after refraction in the lens , two images of the source displaced with respect to each other by d. Find the refractive index of the wedge glass. [Consider only paraxial rays.]

Find the position of the image formed by the lens combination given in the following figure :

A lens is placed between a source of light and a wall. It forms images of are A_(1) and A_(2) on the wall, for its two different positions, the area of the source of light is

In Figure. , the length of object AB is 9cm. Find the nature and position of the final image and also its length. Assum that each lens is a thin lens.

Converging light rays are falling on a convex lens. If the focal length of the lens is 30 cm, then find the position of the image.

A point source of light is moving at a rate of 2 cm-s^(-1) towards a thin convex lens of focal length 10 cm along its optical axis. When the source is 15 cm away from the lens the image is moving at -