When light passes from a rarer to a denser medium the of light changes but the remains unchanged

1. Frequency increases speed decreases
2. frequency is same but wavelength is smaller in denser medium then in rarer
3. frequency is same but wavelength is greater in denser medium then in rarer
4. frequency decrease and wavelength same

Option 2 : frequency is same but wavelength is smaller in denser medium then in rarer

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CONCEPT:

• When light is passed from a rarer medium to a denser medium the frequency of light remains the same but the speed of light decreases.

EXPLANATION:

We know the relation between frequency (f) wavelength (λ) and speed (v):

v = f λ 

When light passes from rarer medium to denser medium frequency remain the same but speed decrease

ν = constant 

λ decreases   

• Option 1 is incorrect because frequency doesn't change in refraction
• Option 2 is correct because in refraction frequency is the same and the wavelength decreases as light travel from rarer to denser.
• Option 3 is incorrect because wavelength decreases as light travel from rarer to denser.
• Option 4 is incorrect because frequency doesn't change in refraction.

So, option 2 is the correct choice.

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