0.33
0.50
0.67
0.75
Correct answer is D
sin isin r = velocity in airvelocity in glass
sin isin 30 = 3×1082×108
Sin i = 34 = 0.75
concave mirror of focal length 5cm
concave mirror of focal length 10cm
convex mirror of focal length 5cm
convex mirror of focal length 10cm
Correct answer is C
Concave Mirror: It is a spherical mirror whose outer surface is polished and inner or concave side is reflecting surface.
Convex Mirror: It is a spherical mirror whose inner surface is polished and outer side or convex side is the reflecting surface.
f = m4 = f = d4
f = 204 = 5cm
If a sound wave goes from a cold air region to a hot air region, its wavelength will?
increase
decrease
decrease then increase
remain constant
Correct answer is A
No explanation has been provided for this answer.