The power of a converging lens is $4.5 D$ and that of a diverging lens is $3 D$ . The power of the combination of these lenses is:

$+ 1.5 D$

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

$- 1.5 D$

No worries! We‘ve got your back. Try BYJU‘S free classes today!

$+ 7.5 D$

No worries! We‘ve got your back. Try BYJU‘S free classes today!

$- 7.5 D$

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A
$+ 1.5 D$

Given: Power of the converging lens (convex lens) $P_{1} = + 4.5 D$
Power of the diverging lens (concave lens) $P_{2} = - 3 D$

Power of the combination of these lenses, $P = P_{1} + P_{2}$

On substituting values, we get $P = (+ 4.5 D) + (- 3 D) = + 1.5 D$ .

Therefore, the resultant power of the combination will be +1.5 D.

Suggest Corrections

Similar questions

Q. The power of a diverging lens is 10D and that of a converging lens is 6D. When these two lenses are placed in contact with each other. The power of their combination will be

Q. A lens of power

+ 2.0 D

is placed in contact with another of power

- 1.0 D

. The combination will behave like

The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?

Q. The far point of a myopic person is 100 cm in front of the eye. What is the nature and power of the lens required to correct the problem?

(a) What do you understand by the power of a lens? Name one factor on which the power of a lens depends.

(b) What is the unit of power of a lens? Define the unit of power of a lens.

(c) A combination of lenses for a camera contains two converging lenses of focal lengths 20 cm and 40 cm and a diverging lens of focal length 50 cm. Find the power and focal length of the combination.

Join BYJU'S Learning Program

The power of a converging lens is 4.5 D and that of a diverging lens is 3 D. The power of the combination of these lenses is:

The power of a converging lens is $4.5 D$ and that of a diverging lens is $3 D$ . The power of the combination of these lenses is: