A light ray in air enters and passes through a block of glass. What can be started with regard to its speed after it emerging from the block?
Speed is less than when in glass
Speed is less than before it entered glass
Speed is same as that in glass
Speed is same as that before it entered glass
An object is placed 12cm away from a convex lens whose focal length is 10cm. What will the nature of the image formed?
Virtual and enlarged
Virtual and reduced in size
Real and reduced in size
Real and enlarged
What happens when complementary colors are mixed together in equal amounts?
They produce a white color
They produce a black color
They produce a black or dark grey color
They produce a dark grey color
What is the reciprocal of the power of a lens and find out the focal length of a lens if the power is1D?
Focal length, 100cm
Power of accommodation, 10cm
Far point, 1/100cm
Focus, 1/10cm
Which of the following is false with regard to optical radiation?
the wavelengths of visible light lie between 400nm and 780nm
ultraviolet A has a shorter wavelength than ultraviolet C
the human lens is better at absorbing shorter than longer wavelengths
eclipse burn is caused by infrared radiation
Combining red and green light (with equal intensity) makes ________ light; combining red and blue light (with equal intensity) makes _______ light; and combining blue and green light (with equal intensity) makes _______ light. Choose the three colors in respective order.
brown, purple, aqua
brown, magenta, yellow
yellow, magenta, brown
yellow, magenta, cyan
An object is placed at a distance of 30.0cm from a thin converging lens a long its axis. The lens has a focal length of 10.0cm. What are the values of the image distance and magnification (respectively)?
60.0 cm and 2.00
15.0 cm and 2.00
60.0 cm and 5.00
15.0 cm and -0.500
Find out the false statement with regard to refraction.
It is a change in direction of light when it passes from one transparent medium into another of different optical density.
Light is deviated away from the normal when it enters an optically dense medium from a less dense medium.
The velocity of light and wavelength are changed during refraction.
The angle of refraction is different for light of different wavelength
Which of the following cannot be considered for the determination of the angle of deviation of a prism?
The refracting angle
The angle of incidence of the ray
The refractive index of the prism material
The thickness of the prism
If a lens gives a positive magnification greater than unity, then what type of image does it indicate?
Real and inverted image having smaller size than the object
Virtual and upright image having larger size than the object
Real and upright image having smaller size than the object
Virtual and inverted image having larger size than the object
