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As the wavelength is increased from violet to red, the luminosity
The one parameter that determines the brightness of a light source sensed by an eye is
It is the total luminous flux.
A normal eye is notable to see objects closer than 25 cm because
Because, the focal length of eye lens can not decrease beyond a certain limit.
Critical angle of light passing from glass to water is minimum for
Which of the following is not the case with the image formed by a concave lens?
What causes chromatic aberration?
In a room containing smoke particles, the intensity due to a source of light will
The index of refraction of diamond is 2.0. The velocity of light in diamond is approximately
A man wants to see two poles, separately, situated at 11 km.The minimum distance (approximately) between these poles will be
What will be the colour of the sky as seen from the earth if there were no atmosphere?