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 splitting up of white light into seven colours on passing through a glass prism is called
refraction
deflection
dispersion
scattering
If the image formed is always virtual, the mirror can be
concave or convex
concave or plane
convex or plane
only convex
The image formed by a concave mirror is seen to be virtual, erect and larger than the object. The position of object must then be
between focal length and twice the focal length
far off (many times the focal length)
close to concave mirror (at less than focal length)
greater than twice the focal length
A virtual image larger than the object can be produced by a
concave lens
concave mirror
convex mirror
plane mirror
The image formed by a spherical mirror is virtual. The mirror will be
concave
convex
either concave or convex
metallic
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
An object is placed at a distance of 15cm from a convex lens of focal length 10cm. The image obtained on the screen is
upright and magnified
inverted and magnified
upright and diminished
The image of an object formed by a plane mirror is
virtual
real
diminished
upside- down
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
