Science
Mirror ‘X’ is used to concentrate sunlight in solar furnace and Mirror ‘Y’ is fitted on the side of the vehicle to see the traffic behind the driver.
Which of the following statements are true for the two mirrors ?
(a) The image formed by mirror ‘X’ is real, diminished and at its focus.
(b) The image formed by mirror ‘Y’ is virtual, diminished and erect.
(c) The image formed by mirror ‘X’ is virtual, diminished and erect.
(d) The image formed by mirror ‘Y’ is real, diminished and at its focus.
options
- (a) and (b)
- (b) and (c)
- (c) and (d)
- (a) and (d)
Answer
(a) and (b)
Reason — Mirror ‘X’ used in a solar furnace is a concave mirror, which concentrates sunlight at its focus, forming a real and diminished image — so statement (a) is true.
Mirror ‘Y’ used as a rear-view mirror is a convex mirror, which forms a virtual, diminished and erect image — so statement (b) is true.
Therefore, the correct statements are (a) and (b).
Related Questions
If pea plants with round and green seeds (RRyy) are crossed with pea plants having wrinkled and yellow seeds (rrYY), the seeds developed by the plants of F1 generation will be :
options
- 50% round and green
- 75% wrinkled and green
- 100% round and yellow
- 75% wrinkled and yellow
An old person is suffering from an eye defect caused by weakening of ciliary muscles and diminishing flexibility of the eye lens. If the defect of vision is ‘a’ which can be corrected by lens ‘b’, then ‘a’ and ‘b’ respectively are :
options
- Hypermetropia and convex lens
- Presbyopia and bifocal lens
- Myopia and concave lens
- Myopia and bifocal lens
Which of the following groups do not constitute a food chain ?
(a) Wolf, rabbit, grass, lion
(b) Plankton, man, grasshopper, fish
(c) Hawk, grass, snake, grasshopper, frog
(d) Grass, snake, wolf, tiger
options
- (a) and (d)
- (a) and (c)
- (b) and (c)
- (b) and (d)