Which of the following can make a parallel beam of light whenlight from a point source is incident on it?(a) Concave mirror as well as convex lens(b) Convex mirror as well as concave lens(c) Two plane mirrors placed at 90° to each other(d) Concave mirror as well as concave lens
Question
Which of the following can make a parallel beam of light whenlight from a point source is incident on it?(a) Concave mirror as well as convex lens(b) Convex mirror as well as concave lens(c) Two plane mirrors placed at 90° to each other(d) Concave mirror as well as concave lens
Solution 1
The correct answer is (a) Concave mirror as well as convex lens.
Here's why:
A parallel beam of light can be produced by a concave mirror or a convex lens when light from a point source is incident on it.
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Concave Mirror: When a point source of light is placed at the focus of a concave mirror, the reflected rays are parallel to each other, forming a parallel beam of light.
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Convex Lens: When a point source of light is placed at the focus of a convex lens, the refracted rays are parallel to each other, forming a parallel beam of light.
On the other hand, a convex mirror or a concave lens would diverge the light rays, and two plane mirrors placed at 90° to each other would simply reflect light at right angles, not create a parallel beam.
Solution 2
The correct answer is (a) Concave mirror as well as convex lens.
Here's why:
A parallel beam of light can be produced by a concave mirror or a convex lens when light from a point source is incident on it.
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Concave Mirror: When a point source of light is placed at the focus of a concave mirror, the reflected rays are parallel to each other, forming a parallel beam of light.
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Convex Lens: Similarly, when a point source of light is placed at the focus of a convex lens, the refracted rays are parallel to each other, forming a parallel beam of light.
The other options do not produce a parallel beam of light:
- A convex mirror and a concave lens both diverge light, so they cannot produce a parallel beam.
- Two plane mirrors placed at 90° to each other will reflect light at different angles, not in a parallel beam.
Solution 3
The correct answer is (a) Concave mirror as well as convex lens.
Here's why:
A parallel beam of light can be produced by a concave mirror or a convex lens when light from a point source is incident on it.
-
Concave Mirror: When a point source of light is placed at the focus of a concave mirror, the reflected rays are parallel to each other, forming a parallel beam of light.
-
Convex Lens: Similarly, when a point source of light is placed at the focus of a convex lens, the refracted rays are parallel to each other, forming a parallel beam of light.
The other options do not produce a parallel beam of light:
- A convex mirror and a concave lens both diverge light, so they cannot produce a parallel beam.
- Two plane mirrors placed at 90° to
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