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an object is placed at a distance of 0.25 m in front of a plane mirror . the distance between the object and image will be
1. 0.25 m
2. 1.0 m
3. 0.5 m
4. 0.125m
the angle of incidence for a ray of light having zero reflrction angle is
1. 0
2. 30
3. 45
4. 90
for a real object , which of the following will produce a real image
1. plane mirror
2. concave mirror
3. concave lens
4. convex mirror
which of the follwing mirror is used by a dentist to examine a small cavity
1. convex mirror
2. plane mirror
3. cocave mirror
4. combination of convex and concave mirror
an object at a distance of 30 cm from a concave mirror gets its image at the same point . the focal length of the mirror is
1. -30 cm
2. 30 cm
3. -15 cm
4. + 15 cm
an object at a distance of + 15 cm is slowly moved towards the pole of a convex mirror . the image will get
1. shortened and real
2. enlarged and real
3. enlarge and virtual
4. dimnished and virtual
a concave mirror of radius 30 cm is placed in water its focal length in air and water differ by
1. 15
2. 20
3. 30
4. 0
a concave mirror of focal length 20 cm forms an image having twice the size of object . for the virtual position of object the poaition oof object will be at
1. 25 cm
2. 40 cm
3. 10 cm
4. at infinity
the image formed by a concave mirror is real , inverted and of the same size as that of the object . the position of object will be
1. at the focus
2. at the centre of curvature
3. between focus and centre of curvature
4. beyond centre of curvature
the nature of the image formed by concave mirror when the object is placed between the focus (F) and centre of curvature (c) of the mirror observed by s is
1. real , inverted and dibished
2. ,virtual , erect and smaller in size
3. real , inverted and enlarged
4. virtual , upright and enlarged
as light travels from a rarer to denser medium it will have
1. increased velocty
2. decreased velocity
3. decrreased wavelength
4. both (b) and (c)
the angle of incidence i and refraction r are equal in a transparent slab when the value of is
1. 0
2. 45
3. 90
4. depend on the material of the slab
the refractive index of transaprent medium is greater than one because
1. speed of light < speed of light in transparent medium
2. speed of light in vacuum > speed of light in transparent medium
3. speed of light in vacuum = speed of light in transparent medium
4. frequency oof light wave changes when it moves from rarer to denser medium
a ray of light travelling from a rarer medium to a denser medium . while entering the denser medium at the point of incidence it
1. goes straight into the second medium
2. bend towards the normal
3. bends away from the normal
4. does not enter at all
which mirror can produce a virtual , erect and magnified image of an object
1. concave mirror
2. convex mirror
3. plane mirror
4. both concave and convex mirror
if the image is formed in front of the mirror , then the image distance will be
1. positive or negative depending on the size of the object
2. neither positive nor negative
3. positive
4. negative
when the object is placed between f and 2f of a convex lens the image formed is at
1. f
2. 2f
3. beyond 2f
4. between o and f
if the magnification produced by a lens has a negative value , the image will be
1. virtual and inverted
2. virtual and erect
3. real and erect
4. real and inverted
a spehrical mirror and a sphericl lens each have a focal length of -10 cm . the mirror and the lens are likely to be
1. both concave
2. botth convex
3. the mirroris concave and the lens in convex
4. the mirror is convex and the lens is concave
if the power of a ens is - 2D , what is its focal length
1. + 50 cm
2. -100 cm
3. -50 cm
4. +100cm
focal length of concave mirror is
1. negative
2. positive
3. depends on the position of object
4. depends on the position of image
in rectangular glss slab incident ray is equal to ...............
1. emergent ray
2. reflected ray
3. refracted ray
4. normal ray
which of the following statement is true
1. a convex lens has 4 diopter power having a focal length 0.25 m
2. a convex lens has -4 diopter power having a focal length 0.25 m
3. a concave lens has 4 diopter power having a focal length 0.25 m
4. a concave lens has -4 diopter power having a focal length 0.25 m
the law of reflection hold good for
1. plane mirror only
2. concave mirror only
3. convex mirror only
4. all mirror irrespective of their shape
a student is standing in front of a magic mirror . she finds he image of her head bigger , the middle portion of her body of the same size and that of the legs smaller . the following is the order of combinations for the magic mirror from the top
1. plane , convex and concave
2. convex , concave , and plane
3. concave , plane and convex
4. convex , plane and concave
.................... mirror is used in torches
1. concave
2. convex
3. plane
4. none o f these
The angle of incidence is equal to the angle of
1. refraction
2. reflection
3. emergence
4. none of these
focal length of plane mirror is
1. at infinity
2. zero
3. negative
4. none of these
a concave mirror gives real , inverted and same size image if the object is placed
1. At F
2. At infinity
3. at c
4. beyond c
the optical phenomena , twinkling of star is due to
1. atmospheric reflection
2. total reflection
3. atmospheric refraction
4. total refraction

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