The primary colours in phothgraphy?are
1). red, blue, yellow
2). red, yellow, green?
3). red, blue, green
4). ?red, green, cyan
A water tank appears shallower when it is viewed from top due to
1). Rectilinear propagation of light
2). Reflection
3). Total internal reflection?
4). Refraction?
In optical instrument, the lenses are used to form image by the phenomenon of -
1). reflection
2). refraction
3). scattering
4). diffusion
?A ray of white light strikes the?surface of an object. If all the colours are reflected the surface would appear:
1). ?Black
2). White?
3). Grey
4). Opaque
Why is red light employed for danger signals?
1). ?red colour is sooting to the eye
2). human eye is most sensitive to red?colour
3). red light is scattered least?
4). ?red light is scattered most