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

Define the power of a lens.

Ranbir claims to have obtained an image twice the size of the object with a concave lens. Is he correct? Give a reason for your answer.

The lens mentioned in 6(b) above is of focal length 25cm. Calculate the power of the lens.

A resistor of 6 Ω is connected in series with another resistor of 4 Ω. A potential difference of 20 V is applied across the combination. Calculate

1. the current in the circuit and
2. the potential difference across the 6 Ω resistor. 

A tank of water is viewed normally from above.

1. State how does the depth of tank appear to change.
2. Draw a labelled ray diagram to explain your answer. 

An object in a denser medium when viewed from a rarer medium appears to be raised. The shift is maximum for ______.

Define the term focal length of a lens.

State the condition for the following a lens has both its focal lengths equal .

State the condition for the following  a ray passes undeviated through the lens .

If the angle of incidence is greater than the critical angle, light is not refracted at all, when it falls on the surface from a denser medium to a rarer medium.

How is the power of a lens related to its focal length?

How does the power of a lens change if its focal length is doubled?

How is the sign (+ or -) of power of a lens related to its divergent or convergent action?

On reducing the focal length of a lens, its power ______.

The power of a lens is + 1.0 D is : 

Express the power (with sign) of a concave lens of focal length 20 cm.

How is accommodation produced?

Which lens has more power a thick lens or a thin lens?