Optics Answers

how is light produce in sky?

unkown spherical mirror is used to form an erect image three times the original size for an object placed at distance 15cm from it find
1-the image position
2-the focal length
3-the kind of the mirror

a light ray initialy in water enters a transprent substance at an angle of inicidence of 37degree and the transmitted ray is refracted at an angle of 25degree calculate the speed of light in the transparent subtance

in young's double slit expmnt. the ratio of max. and min. intensities of fringes are 4:1.what are the amplitudes of the coherent sources?

please answer................

unkown spherical mirror is used to form an erect image three times the original size for an object placed at distance 15cm from it find
1-the image position
2-the focal length
3-the kind of the mirror

can a virtual image be photographed by a camera?

A certain camera has f-numbers that range from 1.3 to 5. If the focal length of the lens is 49 mm, what is the range of aperture diameters for the camera?

Dmin =______ mm

Dmax = _____ mm

Diameter of a plano–convex lens is 6 cm. and its thickness at the centre is 3 mm. What is the focal length of the lens. If the speed of light in the material of lens is 2 × 108 m/s :-
(1) 30 cm
(2) 20 cm
(3) 10 cm
(4) 40 cm

A concave mirror of focal length 'f1' is placed at a distance of 'd' from a convex lens of focal length 'f2'. A beam of light coming from infinity and falling on this convex lens-concave mirror combination returns to infinity. The distance 'd' must equal :
(1) 2f1 + f2
(2) –2f1 + f2
(3) f1 + f2
(4) –f1 + f2

Find the position and magnification,m,of the image formed by a concave mirror of focal length 24 cm when an object is placed 40 cm from the mirror given that m is