Optics Answers

Derive the mirror formula.what is the corresponding formula for a thin lens

A diverging lens, with a focal length of -7 cm is placed 46 cm behind the converging lens. Relative to the diverging lens, where is the image (of the candle) formed by the converging lens?

You ordered a converging lens of focal length 3 m but the company delivered a lens whose focal length was only 1 m. You do not have time to wait for a replacement so you decide to correct the problem by placing a diverging lens next to the lens they sent you. What must the focal length be for this diverging lens?

A converging lens of focal length 24 cm is placed next to a converging lens of length 50 cm. What is the effective focal length for this combination?

A darkened room has a tiny aperture in the roof through which sunlight enters when the sun is directly overhead. What is the size of the sun's image on the floor 12 ft below the aperture? the sun is 93 million miles away, and its diameter is 865,000 miles.

A glass plate 0.9cm thick has a refractive index of 1.5 how long does it take for a ray of light to pass through the plate?

A 60 degree prism of refractive index is 1.5. what is the angle minimum deviation? calculate the angle of refraction of light passing through the prism at minimum deviation and the angle of incidence on the prism at minimum deviation

A coin of radius 'r' is kept at the bottom of a hemispherical vessel of radius 'a'. The coin is not visible when viewed from the edge of the vessel but just visible when a liquid of refractive index 'mu' is poured into the vessel. Prove that r=a( ((mu^2) - 1)/(mu^2 +1))

The critical angle for the material of a prism is 45° and its refracting angle is 30°.A monochromatic ray goes out perpendicular to the surface of emergence from the prism .Then the angle of incidence on the prism will be

Answer is 45°

The magnifications produced by a convex lens for two different positions of an object are m1 and m2 respectively (m1>m2) if "d" is the distance of seperation between the two positions of the object then focal length of the lens is
(1) √m1m2 (2) d/√m1-m2 (3) dm1m2/m1-m2 (4) d/m1-m2 correct answer is d/m1-m2 but how??