Q16DQ
Question
The focal length of a simple lens depends on the color (wavelength) of light passing through it. Why? Is it possible for a lens to have a positive focal length for some colors and negative for others? Explain.
Step-by-Step Solution
Verified Answer
NO, it is not possible.
1Step 1: Definition of Focal length
The term focal length may be defined as the distance between the center of mirror and its focus.
2Step 2: Explain reason of question
The refractive index of the glass related to the light beam in the glass.depend on the wavelength so on different angles different color are appears. For n > 1 and one type of lens the sign of focal length is same.
Hence, it is not possible for a lens to have a positive focal length for some colors and negative for others.
Other exercises in this chapter
Q14DQ
The bottom of the passenger-side mirror on your carnotes, “Objects in mirror are closer than they appear.” Is this true?Why?
View solution Q15DQ
How could you very quickly make an approximate measurement of the focal length of a converging lens? Could the samemethod be applied if you wished to use a dive
View solution Q17DQ
When a converging lens is immersed in water, does itsfocal length increase or decrease in comparison with the value inair? Explain.
View solution Q18DQ
A spherical air bubble in water can function as a lens. Is it a converging or diverging lens? How is its focal length related to its radius?
View solution