A concave mirror has a focal length of 10cm. At which of the following distance should an object be place so that it may form virtual, erect and magnified image?
12cm
25cm
8cm
15cm
The image of an object formed by a plane mirror is
virtual
real
diminished
upside- down
When an object is kep at any distance in front of a concave lens, the image formed is always
virtual, erect and magnified
virtual, inverted and diminished
virtual, erect and diminished
virtual, erect and same size as object
A convex lens has a focal length of 10cm. At which of the following distance should an object be placed in front of this convex lens so that it may act as a magnifying glass?
7cm
20cm
25 cm
The image formed by a plane mirror is
virtual, behind the mirror and enlarged
virtual, behind the mirror and of the same size as the object
real, at the surface of the mirror and enlarged
real, behind the mirror and of the same size as the object
Which of the following would you prefer to use while reading small letters found in a dictionary?
a concave mirror
a concave lens
a convex mirror
a convex lens
Which of the following always diverge light rays?
convex mirror and plane mirror
concave mirror and convex mirror
concave lens and concave mirror
concave lens and convex mirror
The splitting up of white light into seven colours on passing through a glass prism is called
refraction
deflection
dispersion
scattering
A virtual image larger than the object can be produced by a
concave lens
concave mirror
convex mirror
plane mirror
A concave mirror cannot be used as
a magnifying mirror
a torch reflector
a dentist's mirror
a rear view mirror
