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A: Magnification for convex mirror is al...

A: Magnification for convex mirror is always positive where it may be positive or negative for concave mirror.
R: It depends on our choice of sign convention

A

Both assertion and reason are true and the reason is correct explanation of the assertion.

B

Both assertion and reason are true but reason is not correct explanation of the assertion

C

Assertion is true but the reason is false.

D

Both assertion and reason are false.

Text Solution

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The correct Answer is:
B
Both assertion and reason are true but reason is not correct explanation of the assertion
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A concave mirror of focal length 10cm and a convex mirror of focal length 15cm are placed facing each other 40cm apart. A point object is placed between the mirrors, on their common axis and 15cm from the concave mirror. Find the position and nature of the image produced by successive reflections, first at the concave mirror and then at the convex mirror.

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Use the mirror equation to deduce that: (a) An object placed between f and 2f of a concave mirror produces a real image beyond 2f. (b) A convex mirror always produce a virtual image independent of the location of the object. ( c) The virtual image produced by a convex mirror is always diminished in size and it located between the focus and the pole.

Use the mirror equation to deduce that: (a) an object placed between f and 2f of concave mirror produces a real image beyond 2f. (b) a convex mirror always produces a virtual image imdependent of the location of the object. (c ) the virtual image produces by a convence mirror is always dimished in size and in located between the focus and the pole. (d) an object placed between the pole and focus of a concave mirror produces is virtual and enlarged image. [Note : This exercise helps you deduces algebraically properties of images that once obtains from explicit ray diagrams. ]

{:("Column I","Column II"),((A)" An object is placed at a distance equal to focal length from pole before convex mirror",(p)" Magnification is "(infty)),((B)" An object is placed at focus before a concave mirror",(q)" Magnification is (0.5)"),((C) "An object is placed at the centre of curvature before a concave mirror" , (r) "Magnification is (1//3)") , ((D) " An object is placed at a distance equal to radius of curvature before a convex mirror" , (s) "Magnification is (-1)"):}

The focal length of a concave mirror is 30 cm.Find the position of the object in front of the mirror,so that the image is three times the size of the objects.

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