Some sunglasses have photochromic lenses. Photochromic lenses are clear when the lenses are indoors but they darken in bright sunlight to reduce the effects of sunlight. Photochromic lenses react to ultraviolet light. Suggest a benefit of making the lenses go dark with ultraviolet light. (b) Radio waves from Jupiter take 40 minutes to reach Earth.

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Some sunglasses have photochromic lenses - Edexcel - GCSE Physics Combined Science - Question 6 - 2019 - Paper 1

Question 6

Some sunglasses have photochromic lenses. Photochromic lenses are clear when the lenses are indoors but they darken in bright sunlight to reduce the effects of sunl... show full transcript

Worked Solution & Example Answer:Some sunglasses have photochromic lenses - Edexcel - GCSE Physics Combined Science - Question 6 - 2019 - Paper 1

Step 1

Suggest a benefit of making the lenses go dark with ultraviolet light.

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Answer

Ultraviolet (UV) light is the most harmful to the eyes. By making the lenses go dark in UV light, they protect the eyes from potential damage caused by UV rays, which can prevent harm such as cataracts or skin cancer around the eyes. Additionally, it makes it more comfortable for the wearer to see in bright sunlight.

Step 2

Radio waves from Jupiter take 40 minutes to reach Earth.

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Answer

Jupiter is 5 times further away than the Earth. Radio waves and light waves travel at the same speed (in space).

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