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

If a monochromatic beam of light undergoes minimum deviation through an equiangular prism, how does the beam pass through the prism, with respect to its base?

 If white light is used in same way what change is expected in the emergent beam?

Complete the ray diagram given below to show the nature of light produced on the screen.

The completed ray diagram is as shown below: 

(a) Draw a sketch to show how a lens is able to produce an image of the sun on a paper screen.
(b)(i)    Would you regard the rays from the sun as being divergent, parallel or convergent?
(ii)    What is the name given to the point where such rays meet after they have passed through the lens?
(iii)    How does the image of the sun sometimes burn a paper screen?

 What type of lenses are used in spectacles worn by an old lady for knitting?

An object AB is placed in front of a convex lens as shown in fig. 4. Complete the ray diagram and obtain the image formed and state the nature of the image.

An object is placed in front of a converging lens and in front of a diverging lens as in fig.

(a)Complete the ray diagram to obtain an image.
(b)Compare the nature of image formed by both the lenses in the above case.

In the following diagram ., the object and the image formed by the respective lenses are shown. Complete the ray diagram, and locate the focus. Find the focal length of the lens.

In the following diagram  the object and the image formed by the respective lenses are shown. Complete the ray diagram, and locate the focus. Find the focal length of the lens.

In the following diagram , the object and the image formed by the respective lenses are shown. Complete the ray diagram, and locate the focus. Find the focal length of the lens.

In the following diagram , the object and the image formed by the respective lenses are shown. Complete the ray diagram, and locate the focus. Find the focal length of the lens.

Make the rrect choices in the following items :

An object is placed 50 cm from a connverging lens of focal length 30 cm. The image produced would be

In fig., a real image of a point objert O is formed, Which of the following statements is true about each of the arrangements?

1. The object is at the principle focus of the lens.
2. The focal length of the lens is 17 cm.
3. If the mirror is moved so that it is 6 cm from the lens image will also move.

A lens used as a magnifying glass

1. is a diverging lens
2. produces a virtual image
3. is placed with the object nearer the lens than the principal focus

Make the correct choices in the following items:

lf the image can be focused on a screen it must be

Make the correct choices in the following items : 

The image formed by a diverging lens, shown in fig, , is

Define the term focus of a lens.