Home
Class 12
PHYSICS
A boy is trying to start a fire by focus...

A boy is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of focal length `10 cm.` The diameter of the sun is `1.39xx10^(9)` m and its mean distance from the earth is `1.5xx10^(11)m.` What is the diameter of the sun's image on the paper ?

A

`6.5xx10^(-5)m`

B

`12.4xx10^(-4)m`

C

`9.2xx10^(-4)m`

D

`6.5xx10^(-4)m`

Text Solution

Verified by Experts

The correct Answer is:
C

`u=1.5xx10^(11)m`
`u=f=10cm=0.1m`
`(upsilon)/(u)=(h_(i))/(h_(0))`
`rArr" "(0.1)/(1.5xx10^(11))=(h_(i))/(1.39xx10^(9))`
`h_(i)=(1.39xx10^(8))/(1.5xx10^(11))=9.2xx10^(-4)m`
Promotional Banner

Similar Questions

Explore conceptually related problems

A man is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of focal length 10 cm . The diameter of the sun is 1.39 xx 10^(9) m and the diameter of the sun's image on the paper is

The radius of the sun is 0.75xx10^(8)m and its distance from the earth is 1.5xx10^(11)m . Find the diameter of the image of the sun formed by a lens of focal length 40 cm

The diameter of the sun is 1.4 X 10^9m and its distance from the earth is 1.5 X 10^11 m . Find the radius of the image of the sun formed by a lens of focal length 20 cm.

The sun's angular diameter is measured to be 1920''. The distance of the sun from the earth is 1.496xx10^(11)m. What is the diameter of the sun?

The sun's angular diameter is measured to be 1920''. The distance of the sun from the earth is 1.496xx10^(11)m. What is the diameter of the sun?

If the diameter of the Sun is 1.4xx10^9 m and that of Earth is 1.275xx10^4 km .Compare the two.

Find the diameter of the image of the moon formed by a spherical concave mirror of focal length 7.6 m. The diameter of the moon is 3450 km and the distance of the earth and the moon is 3.8 xx 10^5 km.

Determine the diameter of the image formed by a spherical concave mirror of focal length 8 m. The diameter of the moon is 3450 km and the distance between the earth and the moon is approx 4xx10^(5) km.

An object is put at a distance of 5cm from the first focus of a convex lens of focal length 10cm. If a real image is formed, its distance from the lens will be

(i) A diverging lens of focal length 15 cm, forms an image at distance of 10 cm from the lens. How far is the object placed from the lens ? (ii) What is the linear magnification of the image?