Class 10 - Physics - Light - Numerical and Questions
(See also at set 1)
Q1: When an object is placed at a distance of 60 cm from a convex mirror, the magnification produced is 1/2.
Where should the object be placed to get a magnification of 1/3?
Answer:
Answer: (Hint: steps are the same as in the above question, except it is a concave mirror, m = -1/2. Compute f in the first case i.e. f = -20 cm and the compute u in case II i.e. u = 80 cm)
Q1: When an object is placed at a distance of 60 cm from a convex mirror, the magnification produced is 1/2.
Where should the object be placed to get a magnification of 1/3?
Answer:
Q2: When an object is kept at a distance of 60cm from a concave mirror, the magnification is 1/2. Where should the object be placed to get a magnification of 1/3?
Answer: (Hint: steps are the same as in the above question, except it is a concave mirror, m = -1/2. Compute f in the first case i.e. f = -20 cm and the compute u in case II i.e. u = 80 cm)
Q3(CBSE Board): A concave lens made of material of refractive index (n1) is kept in a medium of refractive index (n2). A parallel beam of light is incident on the lens. Complete the path of the rays of light emerging from a concave lens if:
(a) n1 > n2
(b) n1 = n2
(c) n1 < n2
Q4: A convex lens made of material of refractive index (n1) is kept in a medium of refractive index (n2). A parallel beam of light is incident on the lens. Complete the path of the rays of light emerging from a concave lens if:
(a) n1 > n2
(b) n1 = n2
(c) n1 < n2
Answer:
Q7: When a plane mirror is rotated by an angle $\theta$, what will be the angle of rotation of the reflected ray for the fixed incident ray?
Answer: The reflected ray will be rotated twice w.r.t to the angle of rotation of the mirror. i.e. $2\theta$
Consider the following figure:
As shown, mirror M is rotated by an angle $\phi$. Let I be the incident ray, N be normal and R is the reflected ray.
Before rotation, let the incident angle be $\theta$
After rotation, normal moves by angle $\phi$,
Q8: With respect to air the refractive index of kerosene is 1.44 and that of a diamond is 2.42. Calculate the refractive index of diamond with respect to kerosene.
Answer:
(a) n1 > n2
(b) n1 = n2
(c) n1 < n2
Answer:
Q5: Which of the two has great power? A lens of short focal length or a lens of large focal length?
Answer: the lens of short focal length.
Q6: When a convex lens and a concave lens of equal focal lengths are placed side by side, what will be the equivalent power and the combined focal length?
Answer: Equivalent Power = 0 and Combined focal length = infinity.
Answer: The reflected ray will be rotated twice w.r.t to the angle of rotation of the mirror. i.e. $2\theta$
Consider the following figure:
As shown, mirror M is rotated by an angle $\phi$. Let I be the incident ray, N be normal and R is the reflected ray.
Before rotation, let the incident angle be $\theta$
After rotation, normal moves by angle $\phi$,
Q8: With respect to air the refractive index of kerosene is 1.44 and that of a diamond is 2.42. Calculate the refractive index of diamond with respect to kerosene.
Answer:
it is much helpful
ReplyDeleteit's very helpful not much helpful use correct english
DeleteHmmm. Even u forgot to put a comma in your sentence. Use proper punctuation.😑😑😡
DeleteNeed to give more. Numericals
Delete@TanishaSharma, a sentence always starts with a capital letter.
Delete@HARSHVARDHANSINGHChauhan, it’s not “u” it is “you” and it’s not “even u” it’s “you even”.
@Food is Good, you have omitted a word. The word 'but' is missing between 'it's not u' and 'it is you.' Moreover you don't use speechmarks to quote words.
DeleteThanks! For help☺️🙂👍
DeleteThanks! For help☺️🙂👍
DeleteIn Q3 the last n1<n2 should'nt be a convex lens???
ReplyDeletethey have said "if" so we can accept that
Deletei cud hav lookd it earlier
ReplyDeleteThis comment has been removed by the author.
DeleteIn Q2, u cannot be (+)80.... u has to be -ive
ReplyDeletethis is very true but it is said that in hint apply that u is if positive so what will be the answer u should read the question nicely
DeleteQuestions are too easy........post sumthing intresting
ReplyDeleteThank you very much. Found this post very useful
ReplyDeletethanks it is very useful for me!
ReplyDeleteNice
ReplyDeleteIt was really very helpful 😊😊.... Enough to make my concepts better and strong..Thanks a lot!!😊😊☺☺
ReplyDeleteThere should be more numericals....
ReplyDeleteQuestions are too easy
ReplyDeleteplzz give sough one these are so simple that should be interesting and hard s solve
ReplyDeleteit was helpful, try to give more questions, many questions were out of syllabus with regard to boards 2021, however it was easy, try to give tough ones
ReplyDelete