Optics Answers

Unpolarised light of intensity I falls on a polaroid. The emerging light is passed thru another polaroid whose axis makes an angle of 30 degrees with respect to the first one. What is the intensity of final emergent light?

A converging lens has a focal length of 25.5 cm. If it is placed 72.5 cm from an object, at what distance from the lens will the image be? What is the magnification of the lens?

The focal length of a lens in a photo camera is 10 cm. The fixed distance between the lens and the film is 11 cm. If an object is clearly focused on the film, how far must the object be from the lens? What is the len's magnification?

What is the focal length of the lens in your eye when you read a book that is 35 cm from your eye? The distance from the lens to the retina is 19mm.

The convex lens of a copy machine has a focal length of 25cm. A letter to be copied is placed 40 cm from the lens. How far from the lens is the copy paper located? How much larger will the copy be?

The focal length of a convex lens is 17cm. A candle is placed 34cm in front of the lens. Find the location of the image. What is the magnification of the lens?

A dentist uses a small mirror of radius 40 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 16 mm from the tooth, what is the magnification of the resulting image?

An object is 30 cm from a concave mirror of 15 cm focal length. The object is 1.8 cm high. Find the location of the image and its height.

The sun falls on a concave mirror and forms an image 3cm from the mirror. If an object 24 mm high is placed 12cm from the mirror, where will its image be formed? Construct the ray diagram. How high is the image? Find the magnification of the mirror.

A concave mirror collects light from a distant star. How far from the mirror is the image of the star if the radius of curvature is 150 cm?