(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

In the following figure (a) and (b), F₁ and F₂ are positions of the two foci of thin lenses. Draw the path taken by the light ray AB after it emerges from each lens.

(a)

(b)

In figure, (a) and (b), F₁ and F₂ are the two foci of thin lenses and AB is the incident ray. Complete the diagram to show the path of the ray AB after refraction through each lens.

(a)

(b)

A ray of light after refraction through a lens emerges parallel to the principal axis of the lens. The incident ray either passes through ______.

A ray of light incident on a lens parallel to its principal axis, after refraction passes through or appears to come from ______.

In the diagram below, XX’ represents the principal axis, O the optical centre and F the focus of the lens. Complete the path of rays A and B as they emerge out of the lens.

(a)	(b)

Distinguish between a real and a virtual image.

Study the diagram shown in Fig. 5.56

Complete the diagram to show the formation of image A’B’ of the object AB of same size.

Study the diagram shown in the following Figure.

Name the lens LL’ and draw its outline.

Study the diagram shown in Fig. 5.56

where is the object located?

Study the diagram shown in Fig. 5.56

Where is the image formed?

Study the diagram shown in Fig. 5.56

what are the two other characteristics of the image?

The diagram given below shows the position of an object OA in relation to a converging lens L whose foci are at F₁ and F₂.

1. Draw two rays to locate the position of the image.
2. State the position of the image with reference to the lens.
3. Describe three characteristics of the image.
4. Describe how the distance of the image from the lens and its size change as the object is moved towards F₁.

The diagram given below shows the position of an object OA in relation to a converging lens whose foci are at F₁ and F_2.

Describe three characteristic of the image.

The diagram given below shows the position of an object OA in relation to a converging lens whose foci are at F₁ and F₂.

Describe how the distance of the image from the lens and the size of the image change as the object is moved towards F₁.

A ray of light incident parallel to the principal axis of a lens, passes undeviated after refraction.

A ray of light incident at the optical centre of lens, passes undeviated after refraction.

For an object placed at a distance 20 cm in front of a convex lens, the image is at a distance 20 cm behind the lens. The focal length of the convex lens is ______.

State the condition of the following:

A lens has both its focal lengths equal.