WorksheetsLight quiz 1
Total questions: 10
Worksheet time: 2mins
When a plane mirror is rotated through a certain angle, the reflected ray turns through twice as much and the size of the image:
(a) is doubled
(b) is halved
(c) becomes infinite
(d) remains same
A beam of light incident on a plane mirror forms a real image on reflection. The incident beam is :
(a) parallel
(b) convergent
(c) divergent
(d) not certain
A student conducts an experiment using a convex lens. He places the object at a distance of 60 cm in front of the lens and observes that the image is formed at a distance of 30 cm behind the lens. What is the power of the lens?
(a) 0.005 dioptre
(b) 0.05 dioptre
(c) 5 dioptre
(d) 50 dioptre
A full length of image of a distant tall building can definitely be seen using:
(a) a concave mirror
(b) a convex mirror
(c) a plane mirror
(d) both concave as well as plane mirror
You are given water, mustard oil, glycerine and kerosene. In which of these media a ray of light incident obliquely at some angle would bend the most?
(a) Kerosene
(b) Water
(c) Mustard oil
(d) Glycerine
Out of seven colours of white light, which colour has maximum wavelength? (a) Red (d) Green (c) violet (d) Green
(a) Red
(d) Green
(c) violet
(d) Green
A divergent lens will produce
(a) always real image
(b) always virtual image
(c) both real and virtual image
(d) none of these
Which of the given is NOT paired correctly?
(a) Solar furnace-concave mirror
(b) Rear -view mirror-convex mirror
(c) Magnifying glass -convex lens
(d) None of these
The unit of power of lens is
(a) Metre
(b) Centimeter
(c) Diopter
(d) M − 1
In optics an object which has higher refractive index is called
(a) Optically rarer
(b) Optically denser
(c) Optical density
(d) Refractive index
