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प्रश्न
Which type of mirror has:
negative focal length?
उत्तर
concave mirror has a negative focal length because the focus of a concave mirror is in front of the mirror and on the left side.
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संबंधित प्रश्न
Explain with a suitable diagram, how a concave mirror converges a parallel beam of light rays. Mark clearly the pole, focus and centre of curvature of concave mirror in this diagram.
Which mirror always produces a virtual, erect and diminished image of an object?
Which type or mirror is usually used as a rear-view mirror in motor cars?
What would your image look like if you stood close to a large:
convex mirror?
State three characteristics of the image formed by a convex mirror.
A man standing in front of a special mirror finds his image having a very small head, a fat body and legs of normal size. What is the shape of:
(a) top part of the mirror?
(b) middle part of the mirror?
(c) bottom part of the mirror?
Give reasons for your choice.
An object is placed well outside the principal focus of a convex lens. Draw a ray diagram to show how the image is formed, and say whether the image is real or virtual.
To determine the focal length of a convex lens by obtaining a sharp image of a distant object we generally follow the following steps which are not in proper sequence.
(a) Hold the lens between the object and the screen
(B) Measure the distance between the lens and the screen
(C) Select a well lit distant object
(D) Place a screen opposite to the object on the lab table
(e) Adjust the position of the lens to form a sharp image
The correct sequence of these steps is:
(A) c, a, d, e, b
(B) c, d, a, e, b
(C) c, d, e, a, b
(D) c, a, e, d, b
An object at a distance of +15 cm is slowly moved towards the pole of a convex mirror. The image will get ______.
Assertion: A real image cannot be produced by plane or convex mirror.
Reason: The focal length of a convex mirror is always taken as positive.
