Please provide the reason also for the answer.
Dear Student,
When light travels from denser medium to rarer medium ,there is such an angle of incidence for which angle of refraction becomes 90 degree and refracted ray goes along the direction of interface of two media. Such an angle of incidence for which angle of refraction becomes 90 degree is known as critical angle. And, if the angle of incidence is greater than critical angle, ray will get reflected.
Here, it is given that critical angle is less than 45 degree. So, if angle is 45 degree or greater, it will get reflected.
In C option when ray is travelling from denser to rarer angle is 45 degree(Using angle sum property of triangle), so there should have been reflection instead of refraction.
Regards,
When light travels from denser medium to rarer medium ,there is such an angle of incidence for which angle of refraction becomes 90 degree and refracted ray goes along the direction of interface of two media. Such an angle of incidence for which angle of refraction becomes 90 degree is known as critical angle. And, if the angle of incidence is greater than critical angle, ray will get reflected.
Here, it is given that critical angle is less than 45 degree. So, if angle is 45 degree or greater, it will get reflected.
In C option when ray is travelling from denser to rarer angle is 45 degree(Using angle sum property of triangle), so there should have been reflection instead of refraction.
Regards,