Question

Is the focal length of a lens is same in all mediums? Predict.

Answer 1

if the refracted index of immersing liquid is less than the refracting index of lens then the nature of lens remains same”.

if the refracted index of immersing liquid is greater than the refracting index of lens then lens nature get reversed”

Answer 2

No, the focal length of a lens is not the same in all the mediums.

Explanation:

• In a  'double convex lens', refraction is focusing on all the rays towards a point which is known as the  major principal focal point.

• If the 'refracted index' of liquid is lesser than the 'refracting index' of the lens then the 'nature of lens' remains the same.

• If the refracted index of immersing liquid is higher than the refracting index of the lens then lens nature gets reversed.

• In the case of a concave lens, the point where the rays get diverged, the main focal length is the distance where the rays come together and give a negative sign.

• In a thick lens of with a spherical surface, the focal distance changes for various rays and it is called spherical aberration.

Learn more about focal length

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B.You are provided with two lenses of focal length 20cm and 40 cm respectively.....

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