41) Lambert law is related to
Ans) Illumination
42) Who measured the velocity of light
Ans) Romer
43) What the sharpness of a television image is called ( General Science Objective Questions)
Ans) Resolution
44) A mirage occurs because of
Ans) Total internal reflection
45) The final image in the simple microscope is
Ans) virtual, magnified and erect
46) What type of mirrors are used as shaving mirrors (general science objective questions)
Ans) Parabolic mirrors
47) Why red is used as an emergency or danger signal
Ans) As its wavelength is the longest
48) Rainbow is seen after rain because of hanging molecules of water which act as
Ans) Prism
49) Red light is used for signals because it has ( general science objective questions)
Ans) Low refraction in the medium
50) A Periscope works on the principle of
Ans) Total internal reflection