Question

(a) Why danger signals are in red colour?
(b) What will be the colour of sky if there is no atmosphere?
(c) Trace the path of a ray striking a prism, also mention angle of prism and angle of
deviation.
(d) A diverging lens of focal length 15 cm forms an image 10 cm from the lens, how far is
the object is placed from the lens?​

Answer 1

Because the red light has the largest wavelength of all colours, it is the least dispersed. ... Because of this, much of the light gets reflected back and can travel longer distances through clouds, fog, dust etc. to effectively enter our eyes.

2.If there is no atmosphere, the colour of the sky will be

If the Earth had no atmosphere then the sky would have looked dark. The original colour of the sky(or space) is black. Just the atmosphere of the Earth gives the colour white, blue and dark blue.

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Answer 2

(a) Because the red light has the largest wavelength of all colours, it is the least dispersed.

(b) If the Earth had no atmosphere then the sky would have looked dark.

(c) Can't understand this question.

(d) Can't understand this question.

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