Review Sci10-25 SP

Which optical instrument can you use to view a magnified version of a very small yet very near object?

• Camera

• Terrestrial Telescope

• Astronomical Telescope

• Compound Microscope

Answer explanation

A Compound Microscope is specifically designed to magnify very small objects that are close to the lens, making it the ideal choice for viewing tiny details, unlike telescopes which are meant for distant objects.

What are the optical instruments used in a microscope?

• Concave and convex lens

• Two concave lenses

• Two convex lenses

• None of the above

Answer explanation

A microscope typically uses two convex lenses: the objective lens for magnifying the specimen and the eyepiece lens for further magnification. This combination allows for clear and detailed viewing of small objects.

What is TRUE about a telescope as an optical instrument? It _____________________ .

• helps us see distant objects better

• magnifies distant objects

• gives us an erect image of the object

• all of the above

Answer explanation

A telescope helps us see distant objects better by magnifying them and can provide an erect image, making 'all of the above' the correct choice.

A girl wants to see an enlarged image of her face. What can serve her purpose well?

• Plane mirror

• Concave mirror

• Convex mirror

• Magnifying lens

Answer explanation

A magnifying lens is designed to enlarge images, making it ideal for viewing an enlarged image of her face. In contrast, a concave mirror can also magnify but is less effective for a full face view.

What image is formed on the retina by the lens of the eye?

• Real and erect

• Real and inverted

• virtual and erect

• virtual and inverted

Answer explanation

The lens of the eye forms a real and inverted image on the retina. This occurs because light rays converge after passing through the lens, resulting in an image that is upside down and reversed.

Which law gives the relationship between the angle of incidence and the angle of refraction?

• Lens Law

• Mirror Law

• Snell’s Law

• Law of Reflection

Answer explanation

Snell’s Law describes the relationship between the angle of incidence and the angle of refraction when light passes from one medium to another. It is fundamental in understanding how light bends.

What law states that the angle of incidence is equal to the angle of reflection?

• Lens Law

• Snell’s law

• Law of Reflection

• Law of Refraction

Answer explanation

The Law of Reflection states that the angle of incidence, which is the angle at which incoming light strikes a surface, is equal to the angle of reflection, the angle at which it bounces off. This is the correct answer.

The axis that intersects the surface of the mirror at the vertex of the sphere is called __________.

• lens axis

• focal axis

• principal axis

• reflective axis

Answer explanation

The principal axis is the line that passes through the center of the sphere and intersects the mirror at its vertex. It is crucial in optics for defining the geometry of mirrors and lenses.

Which ray is incident along the path parallel to the principal axis and is reflected to the focal point of the mirror?

• Chief Ray

• Focal ray

• Major Ray

• Parallel Ray

Answer explanation

The ray that travels parallel to the principal axis and reflects off the mirror to pass through the focal point is called the Parallel Ray. This is a fundamental concept in optics related to concave mirrors.

Which lens can be used to cure myopia?

• Diverging lens

• Cylindrical lens

• Converging lens

• Any of the above

Answer explanation

Myopia, or nearsightedness, is corrected with a diverging lens, which spreads light rays apart, allowing the image to focus correctly on the retina. Converging lenses are used for hyperopia, not myopia.