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प्रश्न
In which equipment/s do you find ___________________
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उत्तर
(i) Concave mirror is found in torches, headlights, flood lights, solar devices,dentist's mirror.
(ii) Convex lens is used in simple microscope, compound microscope, telescopes, optical instruments and spectacles.
(iii) Reflecting mirrors are used in projector lamps, telescopes.
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संबंधित प्रश्न
If the image formed by a mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it? Draw a ray diagram to justify your answer. Where and why do we generally use this type of mirror?
The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?
A spherical mirror and a thin spherical lens have each a focal length of -15 cm. The mirror and the lens are likely to be ______.
Fill in the following blank with suitable word:
A concave mirror .......... rays of light whereas convex mirror ............ rays
If an object is at infinity (very large distance) in front of a concave mirror, where is the image formed?
With the help of a labelled ray diagram, describe how a converging mirror can be used to give an enlarged upright image of an object.
Which type of mirror is used in a solar furnace? Support your answer with reason.
Name the type of mirror used by dentists. How does it help?
Between which two points of concave mirror should an object be placed to obtain a magnification of:
(a) −3
(b) +25
(c) −0.4
What type of mirror should be used as a shaving mirror?
Which of the following are concave mirrors and which convex mirrors?
Shaving mirrors, Car headlight mirror, Searchlight mirror, Driving mirror, Dentist's inspection mirror, Touch mirror, Staircase mirror in a double-decker bus, Make-up mirror, Solar furnace mirror, Satellite TV dish, Shop security mirror.
How can a concave mirror be used to obtain a virtual image of an object? Draw a diagram to illustrate your answer.
Why are concave mirrors used in solar devices?
Answer the following question:
An object is placed at a distance of 30 cm from a concave lens of focal length 30 cm.
(i) Use the lens formula to determine the distance of the image from the lens.
(ii) List four characteristics of the image (nature, position, size, erect/inverted) in this case.
(iii) Draw a labelled diagram to justify your answer of the part (ii)
The radius of curvature of a concave mirror whose focal length is 5cm is ______
Large ______ mirrors are used to concentrate sunlight to produce heat in solar furnaces.
A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is ______.
The image formed by concave mirror is real, inverted and of the same size as that of the object. The position of object should be ______.
