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Focal length of a convex lens will be maximum for (a) Blue light (b) Yellow light (c) Green light (d) Red light



Focal length of a convex lens will be maximum for


        (a)    Blue light


(b)    Yellow light


        (c)    Green light        


(d)    Red light


Grade:10

2 Answers

Navjyot Kalra
askIITians Faculty 654 Points
7 years ago

(d)

For red light, focal length of Jens is maximum because f proportional to wavelength  and wavelength is maximum for red light

Kushagra Madhukar
askIITians Faculty 629 Points
9 months ago
Dear student,
 
Focal length of a Lens is directly proportional to the wavelength of light falling on the lens.
From the given colours, wavelength is maximum for red light.
Hence the correct option will be (d) Red light
 
Thanks and regards,
Kushagra

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