__________ is used as reflectors in torchlight a) concave mirror b) convex mirror c) plane mirror
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Option a is correct,
Concave mirrors are used as reflectors in torchlight because as per the rules of image formation by a concave mirror when an object is placed at focus the image is formed parallel to the principal axis, as a result, a parallel beam of light rays are formed due to its parabolic shape.
Due to this phenomenon, we are able to see in the darkness from a distance.
Concave mirrors are used as reflectors in torchlight because as per the rules of image formation by a concave mirror when an object is placed at focus the image is formed parallel to the principal axis, as a result, a parallel beam of light rays are formed due to its parabolic shape.
Due to this phenomenon, we are able to see in the darkness from a distance.
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⏺️Option B is correct that is concave mirror.
⏺️The concave mirrors are placed behind the bulb.
⏺️The bulb is exactly at the focus.
⏺️When the bulb is switched on, some of its rays are incident to the concave mirror behind it.
⏺️As a result, the rays are reflected parallely and towards infinit (if object is placed at focus then the image forms at infinity).
⏺️⏺️Hence, we are able to see clearly when we on the torch.
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⏺️Option B is correct that is concave mirror.
⏺️The concave mirrors are placed behind the bulb.
⏺️The bulb is exactly at the focus.
⏺️When the bulb is switched on, some of its rays are incident to the concave mirror behind it.
⏺️As a result, the rays are reflected parallely and towards infinit (if object is placed at focus then the image forms at infinity).
⏺️⏺️Hence, we are able to see clearly when we on the torch.
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