A beam of light traveling in air strikes a glass slab at an angle of incidence l
ID: 1645755 • Letter: A
Question
A beam of light traveling in air strikes a glass slab at an angle of incidence less than 90 degree. After entering the glass slab, what does the bean of light do? (There slab at an angle of incidence less could be more than one correct choice.) I follows the same path as before it struck the glass. It follows the normal to the glass slab. It bends away from the normal at the point of contact. It bends closer to the normal at the point of contact. It slows down. Sometimes when you look into a curved mirror you see a magnified image (a great big you) and sometimes you see a diminished image (a little you). If you look at the bottom (convex) side of a shiny spoon, what will you see? You won't see an image of yourself because no image will be formed. You will see a little you, upside down. You will see a little you, right side up. You will see a little you, but whether you are right side up or upside down depends on how near you are to the spoon. You will either see a little you or a great big you, depending on how near you are to the spoon. Suppose you wanted to start a fire using a mirror to focus sunlight. Which of the following statements is most accurate? It would be best to use a plane mirror. It would be best to use a convex mirror. It would be best to use a concave mirror, with the object to be ignited positioned at the center of curvature of the mirror. It would be best to use a concave mirror, with the object to be ignited positioned halfway between the mirror and its center of curvature. One cannot start a fire using a mirror, since mirrors form only virtual images.Explanation / Answer
answer of question 7
here light beam travelling from air to glass that is medium change . but as the angle of incident is less than 90 degree , so it is not go along straight path .
hence answer A is wrong
if the angle of incident is 0 degree (which is less than 90 degr) then it goes normal to the glass plate . hence the answer B is correct ( condition angle of incident = 0 degree)
As glass medium is denser than air , therefore light bends towards the normal ,
therefore answer C is wrong and D is correct .
VELOCITY OF LIGHT does not depends on medium .
so E is wrong
Answer of question 8
correct answer is E ,
because bottom side of spoon works as convex lens . if you are within its focal distance , then you will see a bigger image otherwise smaller image
Answer of question 9
Answer is B
as convex mirror has power to accumulate all light beams at a point (that is focal point )
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