Red and blue
Green only
Red and green
Red only
Correct answer is B
No explanation has been provided for this answer.
For a short sighted person, light rays from a point on a very distant object is focused
in front of the retina
on the retina by a converging lens
behind the retina by a diverging lens
in front of the retina, a distance 2F from the lens
Correct answer is A
No explanation has been provided for this answer.
20cm
15cm
10cm
5cm
Correct answer is C
F = \(\frac{uv}{u + v}\); v = 2u
20 = \(\frac{ux - 2u}{u + (-2u)}\); u = 10cm
reflection only
refraction only
diffraction and interference
reflection and refraction
reflection and diffraction
Correct answer is A
No explanation has been provided for this answer.
0.75cm
4.00cm
8.00cm
12.00cm
Correct answer is D
\(\frac{\text {object height}}{\text{image height}}\) = \(\frac{\text {object distance}}{\text{image distance}}\)
\(\frac{3}{\text{image height}}\) = \(\frac{10}{40}\)
Image height = 12cm