Science Write True or False

Generally, using the same objective lens, but different eyepieces, different magnification can be obtained.

The conical cells respond to the intensity of light and communicate the degree of brightness and darkness to the brain.

The rod like cells respond to colours and communicate the presence of colours in the retinal image of the brain.

The conical cells can respond differently to red, green and blue colours.

In television, we see a continuous picture due to persistence of vision.

In a compound microscope, a real image acts as an object for the eyepiece.

A compound microscope forms an erect and real image of a small object.

In a simple microscope, the object is placed within the focal length of the convex lens.

As one grows old, ciliary muscles become weak.

Farsightedness can be corrected using spectacles having convex lenses of suitable focal length.

Nearsightedness can be corrected using spectacles having convex lenses.

Absence of rod like cells results in colour blindness.

An object of height 2 cm forms an image of height 3 cm when placed in front of a concave lens.

The principal focus of a convex lens is virtual.

The image formed by a concave lens is always virtual.

When an object is placed in front of a concave lens, its image is obtained on the opposite side of the object.

When red light falls on the eyes, the cells responding to red light get excited more than those responding to other colours and we get the sensation of red colour.

A convex lens is used to correct hypermetropia.

A concave lens is used to correct myopia.

A convex lens is used as a simple microscope.

A concave lens is used as a magnifying glass.

The magnification produced by a convex lens is positive or negative depending on the object distance.

The magnification produced by a concave lens is positive or negative depending on the object distance.

The focal length of a concave lens is negative.

Due to the light sensitive cells in the eye, we get information about the brightness or dimness of the object and the colour of the object.

A convex lens always forms a virtual image.

A concave lens always forms a virtual image.

A convex lens is a diverging lens.

A concave lens is a converging lens. (March 2019)

If the power of a lens is 2 D, its focal length = 0.5 m.

In the compound microscope, two concave lenses are used.

The focal length of a convex lens is positive.

Auditory nerve take the impulse from eye to brain.

The perception of colours is concerned with cone cells.

The light is first and maximum refracted as it passes through eye lens.

Cornea gives colour to the eye.

Hypermetropia can be corrected by using a spectacle of convex mirror.

Myopia can be corrected by using a spectacle of concave lens.

A lens is an opaque object.