2Q_POST TEST_Image formation using lens

If the height of the doll is 20 cm which is placed 20 cm in front of a convex lens where the image formed is located at 60cm opposite side of the lens, what will be the height of the image?

• The image height of the doll is 30 cm, upright.

• The image height of the doll is 30 cm, inverted.

• The image height of the doll is 60 cm, upright.

• The image height of the doll is 60 cm, inverted.

How does the objective lens magnify the image of a specimen?

• It uses a diverging lens to form an upright, enlarged, virtual image.

• It uses a diverging lens to form an inverted, enlarged, real image.

• It uses a converging lens to form an upright, enlarged, virtual image.

• It uses a converging lens to form an inverted, enlarged, real image

Which statement is NOT TRUE about camera?

• The convex lens forms a diminished, real image.

• The lens focuses the light to the film or camera sensor.

• The shutter controls the amount of light that enters the lens.

• The film or camera sensor captures the light coming from the lens

Why high-powered telescopes use convex mirror?

• Convex mirror is cheaper and lighter than lenses.

• Convex mirror reduces distortion of colors (chromatic aberration)

• Convex mirror can gather small amount of light forming sharper and clearer image

Which shows the correct sequence of image formation in reflecting telescopes? 

I. A plane mirror catches and redirects the light.      

II.    Light converges after hitting the parabolic mirror.   

III.  Light from the distant object enters the telescope.               

IV.  The light rays refract on the eyepiece producing an enlarged image.              

• I, II, III, IV

• III, II, I, IV

•  IV, I, III, II

• III, I, II, IV

Which statement below is TRUE about lenses?

• Convex lens will diverge light

• Concave lenses are thicker at the center and thinner at the edges.

• Convex lens is also known as Converging lens

A light ray enters from medium A to medium B as shown in the figure. Based on the refraction of light, to which medium is air and to which is glass lens.

• Medium A is air while Medium B is glass lens because light ray refracted towards the normal indicating greater density of the medium.

• Medium A is glass lens while Medium B is air because light ray refracted towards the normal indicating greater density of the medium.

• Medium A is air while Medium B is glass lens because light ray refracted towards the normal indicating no changes within its medium.

• Medium A is glass lens while Medium B is air because light ray refracted towards the normal indicating a greater density and velocity of light.

Why no image is formed when the object is placed at the principal focus of a convex lens?

• The refracted rays will be at the focus.

• The refracted rays will be parallel to each other.

• The refracted rays will diverge and never intersect.

• The refracted rays will be perpendicular to each other.

Why do astronomers prefer to use a reflecting telescope in viewing astronomical objects?

• It collects less light than lenses.

• It can preserve the colors of the object.

• It creates a clearer image of the object.

• It produces an upright image of the object.

Which optical instrument offers the widest field of view?

• Binoculars

• Compound microscope

• Magnifying glass

• Telescope