Optics Answers

Which of the following is NOT true of experiments involving curved mirrors?
image distance is negative for for real image
object distance is positive
image distance is negative for virtual image
focal length is negative for convex mirrors

An estimate of the refractive index of glass is 1.5. If the angle of incidence is
30o
the angle of refraction is

A STAR EMITTING RADIATION AT A WAVELENGTH OF 5000Å IS APPROACHING EARTH AT A VELOCITY OF 1.5x10^6 m/s. THE CHANGE IN WAVELENGTH ON EARTH IS :
1. 2.5Å
2. 1000 Å
3. ZERO
4. 25 Å

.A man wants to get a picture of a zebra. He photographed a white donkey after fitting a glass,
with black stripes, on to the lens of his camera. What photo will he get?

Suppose you are inside the water in a swimming pool near an edge. A friend is standing on the
edge. Do you find your friend taller or shorter than his usual height?

THE MAGNIFYING POWER OF GALILEAN TELESCOPE IN THE NORMAL ADJUSTMENT IS 20.THE DIFFERENCE BETWEEN THE MAGNIFYING POWER AND LENGTH OF THE TELESCOPE IS 19.05.THE FOCAL LENGTH OF OBJECTIVE AND EYE PIECE ARE : (inmeters)

1. 1 and -0.05

2. 0.05 and 2

3. 1 and 0.05

4. 2 and 0.05

THE IMAGE OF A SMALL ELECTRICAL BULB FIXED ON THE WALL OF A ROOM IS TO BE OBTAINED ON THE OPPOSITE WALL 4m AWAY BY MEANS OF A LARGE CONVEX LENS.THE MAX. PSSIBLE FOCAL LENGTH OF THE LENS REQUIRED FOR THIS PURPOSE WILL BE :

1. 0.5m

2. 1m

3. 1.5m

4. 2m

A glass slab is placed over a page of letters in which the letters are printed with different colors. Which letter would appear to be maximum raised and which one minimum raised?

An equiconvex lens of radius of curvature is cut in two equal parts by vertical plane so it becomes plano convex. if "f" is the focal length of equi convex lens then what will be the focal length of plano convex lens?

The power of a convex lense is 5D.At what distance object should be placed from the lense so that, 2 times larger image is formed.