a ray incident on a plane mirror. for what angle of incident the ray wll undergo deviation

charvi saraswat

a ray incident on a plane mirror. for what angle of incident the ray wll undergo deviation of 4pi/5 radian???

Mr Perfect

Hello charvi, You have not mention that the medium change or not, If It's travel in both Rare and denser medium we ca use n1*sin(ө1)=n2*sin(ө2) So,n1 and n2 are two mediums and ө1 is indent ray angle , the deviation 4pi/5 radians is known as 144 degrees,Hense by above n1 and n2 are same in the air i.e 1.33.sin(144)=sin(ө) ө=36 degrees

Mr Perfect

Hello charvi,I am not sure I may think................... You have not mention that the medium change or not, If It's travel in both Rare and denser medium we ca use n1*sin(ө1)=n2*sin(ө2) Here,n1 and n2 are two mediums and ө1 is indent ray angle , the deviation 4pi/5 radians is known as 144 degrees,Hense by above n1 and n2 are same in the air i.e 1.33.sin(144)=sin(ө) ө2=36 degrees

Abhimanyu

ah...its obvious dude....medium doesnt change.....

charvi saraswat

ok...but the answer is 18 degree.... and medium kyu change hoga???? mirror hai na... to bas reflection hi to hoga????

Rudra Prasad Neupane

First understand that the angle of deviation is the angle between the initial direction of incident ray and reflected raythen, draw a diagram i+r=pi-4*pi/5 then angle of incidence = (i+r)/2 =pi/10 =18 degrees

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