Answer (b)

Q(b). For the incident ray LM shown, complete the diagram to show the path of the ray into and out of the prism. The critical angle of glass is 42°.

            
 

at what angle does incident ray strikes??
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Priyansh it's not given
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I hope u got it
Arpita...

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?????
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How did u get that angle of incidence is 45
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The ray is straight.when penetrates get total internally reflected.as the angle of incidence is 45' more than critical angle.

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This was my suggestionnot the one snt earlier

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The angle at left is 45' because cointerior angles are equal.
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Please find this answer

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Hii I'm Kumar Kanzariya Indian army boy
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THANKS 
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