The diameter of the sun is `~~ 10^9 m`, but it appears to be a small disc, why ?
Text Solution
Verified by Experts
This is because the distance of the sun from the earth is very large `(~~ 10^(11)m)`. `:.` Angle subtended by the sun at our eye `~~ 10^(9)//10^(11) = 10^(-2)` radian. The same angle is subtended by a disc of diameter `1 cm` at a disatnce of `100 cm`. From the eye. Hence the sun looks like a small disc.
Topper's Solved these Questions
OPTICS
PRADEEP|Exercise Very short answer question|5 Videos
OPTICS
PRADEEP|Exercise very short answer questions|1 Videos
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
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 angular diameter of the sun is 1920". If the distance of the sun from the earth is 1.5xx10^(11) m, what is the linear diameter of the sun ?
The approximate diameter of the sun is times the diameter of Earth.
The diameter of the sun is expressed as 13.9xx 10^(9) m . Find the order of magnitude of the diameter ?
To find the distance around a circular disc, multiply the diameter of the disc by 3.14. What is the distance around the disc when the diameter is 18.7 cm?
