What is the power of a concave lens of focal length?

What is the power of a concave lens of focal length?

The power of the lens is the reciprocal of the focal length of the lens. We know that, The focal length is the negative for the concave lens. Hence, The power of the concave lens is -0.5 D.

What is the power of a concave lens of focal length 4 m?

Power of a lens is equal to the reciprocal of its focal length. It is given by : So, the power of the lens is 0.25 D.

What is the power of concave lens of focal length 10 m?

P=−101⇒P=−0. 1D.

What is the power of a concave lens of focal length 10 Centimetre?

Now, putting this value of focal length in the formula for the power of a lens. Thus, the powerof this convex lens is +10 dioptres which is also written as +10D. The plus sign with the power indicates that it is converging lens or convex lens.

What is the power of concave lens?

The power of a lens is defined as the reciprocal of the focal length. Lens power is measured in dioptres (D). Converging (convex ) lenses have positive focal lengths, so they also have positive power values. Diverging (concave ) lenses have negative focal lengths, so they also have negative power values.

What is the power of a concave lens of?

The focal length of a concave surface is negative, whereas the focal length of a convex surface is positive. Therefore, for a lens, the power of a concave and convex lens is negative and positive respectively.

What is the power of a concave lens of a focal length 25cm?

f=-25cm As P=100f,f=100-25=-4dioptre. A concave mirror produces three times magnified real image of an object placed at 10 cm in front of it.

How do you find the power of a concave lens?

Answer

1. Given that, Focal length of the concave lens, f = 2 m.
2. To find, Power of the lens.
3. Solution, The relation between power and focal length of the lens is inverse. Power is given by : P = 1/f.
4. f is the focal length of the lens and it is negative for concave lens.

What is the power of the concave lens whose focal length is 5 m?

=>Given=Focal length=5m. =Power=? ☞So the power of the lens is -1/5 or -0.

What is the power of a lens of focal length 0.5 cm?

P = 1/f = 1/0.5 = +2 D.

What is the focal length of a lens whose power is D?

Answer: Focal length f= 1/p So according to the question power is +2.0 D f= 1/2.0 = 0.5 m In centimeter …the focal length is 50cm.

How do you find the focal length of a lens when the power is given?

Dear Student,

1. ◆ Answer – Focal length = -50 cm. Type of lens = Concave.
2. # Given – Power of lens = – 2 D.
3. # Solution – Formula for power of the lens ia given by –
4. Power of lens = 1 / focal length. Substitute value,
5. Focal length = -50 cm. Therefore, focal length of lens is -50 cm and it is a concave lens (d/t negative power).

What is the power of concave lens of focal length 20cm?

i.e P=−5D.

What is the power of a concave lens of focal length 15cm?

Answer. therefore the power of the lens is 0.067.