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

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.

A boy is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of focal length 10cm . 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 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 diameter of the moon is 3.5xx10^(3)km and its distance from the earth is 3.8xx10^(5) km . It is seen by a telescope having the focal length of the objective and the eye-piece as 4m and 10cm respectively. The diameter of the image of the moon will be approximately

The solar energy received by the Earth persquare metre per minute is 8.315 xx 10^(4)Jm^(-2)min^(-1) . If the radius of the Sun is 7.5 xx 10^(5) km and the distance of the Earth from the Sun is 1.5 xx10^(8) km, calculate the surface temperature of Sun. Assume the Sun as a perfect black body. Given that Stefen constanta sigma = 5.7 xx 10^(-8)Wm^(-2)K^(-4).

The diameter of the moon is 3.5 xx 10^(3)km and its distance from the earth is 3.8 xx 10^(5)km . It is viewed by a telescope which consists of two lenses of focal lengths 4m and 10 cm. Find the angle subtended at eye by the final image.

The approximate diameter of the sun is times the diameter of Earth.

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