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

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 ?

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 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

Compare the distance of the sun from the earth and the distance of the mars from the Earth if the Sun is 1.5xx10^(8) km from the Earth and the Mars is 5.5xx10^(7) km from the Earth.

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 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 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

If aperture diameter of telescope is 10m and distance Moon and Earth is 4 xx 10^(5) Km . With wavelength of lightis 5500 Å . The minimum separation between objects on surface of Moon, so that they are just resolved is close to :

If aperture diameter of telescope is 10m and distance Moon and Earth is 4 xx 10^(5) Km . With wavelength of lightis 5500 Å . The minimum separation between objects on surface of Moon, so that they are just resolved is close to :

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.