The nature of image formed by a convex mirror is ____.
virtual
erect
diminished
All of the above
On using candle to find focal length of concave mirror, one should keep ____.
flame vertically up
fan off
use the scale slanted
Both A and B
The image of a distant object is obtained on a screen by using a concave mirror. The focal length of the mirror can be determined by measuring the distance between ____.
the object and the mirror.
the object and the screen.
the mirror and the screen.
the mirror and the screen as well as that between the object and the screen.
In solar cookers, the type of mirror used as a concentrator is ____.
plane
concave
convex
May be (a) or (c)
The character that will remain unaltered as light moves from one medium to another is ____.
velocity
wavelength
frequency
None of the above
You are advised not to see the SUN directly with your eye, because the converging light will destroy the ____.
retina
eye-ball
eye-lens
pupil
Who among the following uses a concave mirror?
Automobile rider
Shop—keeper
Dentist
All of the above
/
None of the above
A concave mirror is distinguished from a convex mirror using the property of ____.
convergence
divergence
magnification
linear propagation
If a cardboard is placed (close to the mirror) to cover half the size of the concave mirror, the image formed will be ____.
complete
brighter
dimmer
Both A and C
The mirror used as a thief indicator in a market place is a ____.
concave
convex
plane
Any of these
If a large number of thin black strips are painted on the concave mirror, the image of a distant white horse will be ____.
a zebra
white horse
dimmer white horse
darker white horse
/
If a pencil beam is allowed to fall along the principle axis, of a concave mirror the ray will ____.
emerge out of principle axis.
retrace its path along principle axis.
/
A student obtains a blurred image of an object on a screen by using a concave mirror. In order to obtain a sharp image of the same object on the screen, he will have to shift the mirror ____.
to a position very far away from the screen.
little away from the screen.
towards the screen
either towards or away from the screen depending upon the position of the object.
To determine the focal length of a concave mirror, a student focuses a distant object using the concave mirror. The best object can be ____.
a distant tree
sun
classroom window
All of the above
Out of the following, the best way to do the experiment on finding the focal length of a concave mirror by obtaining the image of a distant object is to ____.
hold the mirror in hand and keep the screen in a stand kept behind the mirror.
hold the mirror in a stand and hold the screen in hand, with the screen in front of the mirror.
keep both the mirror and screen in suitable stands with the screen put in front of the mirror.
keep both the mirror and then screen in suitable stands with the screen put in behind the mirror.