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The sun subtends an angle of half a degree at the pole of a concave mirror which has a radius of curvature of 15 metres. Then the size (disameter) of the image
of the sun formed by the concave mirror is
θ = (1/2)o
= [π/2]/180
= π/360rad
The image of sun is formed at focus.
θ = d/f
⇒ d = fθ
= 15/2 × π/360
= 0.0654m
=6.54cm
A ray of light strikes a plane mirror PQ at an angle of incidence of 30∘, is reflected from the plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is: Draw a ray diagram to illustrate your answer.
Ray AB strikes the mirror PQ at B and gets reflected along BC according to the laws of reflection. The ray BC incident on mirror QR makes an angle 300 with the mirror. So, the angle of incidence on this mirror is 900 −300 = 600 . Hence, the angle of reflection is also 600
A ray of ligth makes an angles of with the horizontal and strikes a plane mirror which is inclined at an angle
to the horizontal.The angl
for which
the reflected ray becomes vertical, is
50o + θ = 90o
θ=40o
If the critical angle for total internal reflection from a medium to vacuum is 30°
the velocity of light in the medium is
The minimum deviation for a ray of light through a prism is 44° and when this happens the angle of incidence is 50° The refracting angle of the prism is
When the object is at a distance x1 and x2, a real and a virtual image of the same size are formed respectively. The focal length of the convex lens is
A person can see objects only at distance greater than 40 cm. He is advised to use lens of power
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