The mercury and sodium street lamps light up because of.
1). Electron absorption
2). Electron emission
3). Atomic emission?
4). Atomic absorption
?Different objects at different?distances are seen by the eye. The paramenter athe remains. Constent is
1). the focal length of the eye lens
2). the object distance from the eye lens
3). the radii of curvature of the eye lens
4). the image distance from the eye lens
?In a healthy human eye, the focusing?is done by the
1). To and from movement of the eye lens?
2). Changing curvature of the retina
3). Change in the convexity of the lens?throught ciliary muscles
4). Change in the refractive index of the eye fluid
The image formed on the retine of a?human eye is
1). ?virtual and inverted
2). virtual and erect?
3). real and erect
4). real and inverted
In the human eye, the focussin is?done by
1). to and fro movement of the eye lens?
2). to and from movement of the retine
3). chang in the convexity of the eye lens
4). Change in the refractive index of the eye fluids.