The most suitable type of mirror used for the construction of the search light is the?
concave mirror
convex mirror
spherical mirror
parabolic mirror
Correct answer is D
In optics, parabolic mirrors are used to gather light in reflecting telescopes and solar furnaces, and project a beam of light in flashlights, searchlights, stage spotlights, and car headlights.
30o
45o
51o
90o
Correct answer is B
Number of image = \(\frac{360}{\theta}\) -1
7 = \(\frac{360}{\theta}\) -1
thus,\(\theta\) = 45o
virtual and diminished
magnified and erect
real and inverted
diminished and erect
Correct answer is B
In a concave mirror, when the object distance is less than the focal length, we have an image which is:
- Virtual
- Erect and
- Magnified.
70Hz
840Hz
1120Hz
1960Hz
Correct answer is D
F3 = 7Fo
= 7 x 280
= 1960Hz
100ms-1
120ms-1
200ms-1
250ms-1
Correct answer is C
In strings, \(\lambda\) = 2L
V = F\(\lambda\)
= 200 x 2 x 0.5
= 200ms-1