The image formed by retina of human eye is
Answer: Real and inverted
The phenomena of light responsible for the working of the human eye is
Human eye acts like a
A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power
The clear sky appears blue, because
Answer: violet and blue lights get scattered more than lights of all other colours by the atmosphere
Which of the following statements is correct?
Answer: A person with myopia can see nearby objects clearly
The colored light that refracts most while passing through a prism is
The change in the focal length of human eye is caused due to
Short sightedness can be corrected if
Answer: Diverging glasses is used
A student sitting on the last bench can read the letters written on the blackboard but is not able to read the letters written in his text book. Which of the following statements is correct?
Answer: The near point of his eyes has receded away
Which of the following statements is correct regarding the propagation of light of different colours of white light in air?
Answer: All the colours of the white light move with the same speed
Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?
Answer: Scattering of light
When light rays enter the eye, most of the refraction occurs at the
Answer: outer surface of the cornea
The focal length of the eye lens increases when eye muscles
Answer: Are relaxed and lens becomes thinner
The amount of light entering the human eye is controlled by
Colored portion of eye that controls amount of light reaching retina is known as
Innermost layer of eyeball is
At noon the sun appears white as
Answer: light is least scattered
The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light
Answer: Is scattered the least by smoke or fog
The least distance of distinct vision for a young adult with normal vision is