BUDS PUBLIC SCHOOL, DUBAI
NAME:
PHYSICS
GRADE-10
REVISION WORKSHEET
LIGHT- REFLECTION AND REFRACTION
1. Which spherical mirror does always produce a virtual, erect and diminished image of an
object?
2. A mirror is turned through 15 .° By what angle will the reflected ray turn?
3. Find the deviation produced by reflection at a plane mirror when the angle between the
incident and reflected rays is 80°.
4. When two lenses of focal length +10 cm and −5 cm are placed in contact, then find the net
power.
6. Light coming from the bottom of a water tank does not come out of the water. What should be
the minimum angle of incident for the same?
6. Whatever may be the position of an object, the image appears to be erect. Give the nature of
mirror with reason.
7. An object is kept in front of a concave mirror of focal length 15 cm. The image formed is three
times the size of object. Calculate two possible distances of the object from the mirror.
8. Draw a ray diagram to show the image of an object placed between f and 2 f of a thin convex
lens. Deduce the relation between the object and image distance and focal length.
9. Where should an object be placed from a converging lens of focal length 20 cm, so as to
obtain a real image of magnification 2?
10. Monochromatic light of wavelength 589 nm is incident from air on a water surface. What are
the wavelength, frequency and speed of:
(a) Reflected light
(b) refracted light?
( µ of water = 1.33)
11. A girl in the mirror laughing house finds her face appearing highly magnified, lower portion
of her body of the same size but laterally inverted and middle portion of the body highly
diminished in size. Can you guess the design of the mirror?
12. Find the position of an object which when placed in front of a convex mirror produces a
virtual image, which is half of the size of object
13. This story is often told about the world-famous pianist, Jane who is also known for his
passion for personal grooming. He used to use a specially designed mirror for shaving. He was
once asked by a fellow musician if he could be ready, at very short notice, to take over and play a
difficult piece of music at a concert because the pianist who was supposed to play had suddenly
fallen ill.“I am always ready. I have practiced eight hours every day for forty years to be ready,”
replied Jane. The pianist said, “I wish I had been born with such determination.” Jane replied,
“We all are born with it. I just use mine.”
Read the above passage and answer the following questions:
(a) What kind of mirror is used by Jane for shaving?
(b) Draw the ray diagram to show the formation of image by this mirror to focus the bright image
of sun at paper sheet.
(c) What values are shown by Jane?
[Value Based Question]
14. Establish the relation between object distance, image distance and radius of curvature for a
convex mirror.
15. Find the position of an object which when placed in front of concave mirror of focal length
20cm produces a virtual image, which is twice the size of object.
************************