Advertisements
Advertisements
Question
The concave reflecting surface of a torch got rusted. What effect would this have on the beam of light from the torch?
Advertisements
Solution
The beam of light from the torch will be diffused with lower intensity due to the rusted reflecting surface.
APPEARS IN
RELATED QUESTIONS
A ray of light is incident on a plane mirror making an angle of 90° with the mirror surface. The angle of reflection for this ray of light will be:
(a) 45°
(b) 90°
(c) 0°
(d) 60°
For what position of an object, a real and diminished image is formed by a concave mirror?
According to the "New Cartesian Singh Convention" for mirrors, what sign has been given to the focal length of:
a convex mirror?
According to New Cartesian Sign Convention:
(a) focal length of concave mirror is positive and that of convex mirror is negative
(b) focal length of both concave and convex mirrors is positive
(c) focal length of both concave and convex mirrors is negative
(d) focal length of concave mirror is negative and that of convex mirror is positive
What would your image look like if you stood close to a large:
concave mirror?
A student obtained a sharp image of the grills of a window on a screen using a concave mirror. His teacher remarked that for getting better results a well lit distant object (preferably the sun) should be focussed on the screen. What should be done for this purpose?
(A) Move the screen slightly away from the mirror
(B) Move the mirror slightly towards the screen
(C) Move the screen and the mirror away from the object
(D) Move the screen and the mirror towards the object
Match the following.
| Convex mirror | Radio telescopes |
| Parobolic mirror | Rear – view mirror |
| Snell’s law | Kaleidoscope |
| Dispersion of light | sin i/sin r =μ |
| Refractive index | Rainbow |
Give any two applications of a concave and convex mirror.
Which of the following mirror is used by a dentist to examine a small cavity in a patient’s teeth?
What is a concave and convex mirror?
