Alberta Grade 8 Science – Light and Optical Systems Practice Test
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About this Exam
Prepare with the Alberta Grade 8 Science – Light and Optical Systems Practice Test practice quiz. This question bank includes 10 questions covering light, lens, describes, pupil, and reflection. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.
Sample Questions
Question
1
What is the function of the cornea?
Explanation:
The cornea is the clear front surface of the eye that helps shape the eye and begins focusing light by bending it. Among the options, the one about giving the eye its shape fits best because the cornea is part of the eye’s outer layer that contributes to the eye’s curved front, which helps maintain the eye’s overall shape. The other options refer to features that aren’t the cornea: the hole that lets light in is the pupil, the cornea doesn’t absorb light like a filter, and the jellylike tissue behind the lens is the vitreous humor. So, giving the eye its shape is the choice that aligns most closely with the cornea’s role in the eye’s structure.
Question
2
Which term describes the pupil?
Explanation:
Think about how light gets into the eye. The pupil is the opening in the center of the iris that light passes through to reach the inside of the eye. It acts like a doorway, opening wider in dim light and narrowing in bright light to control how much light reaches the retina. The other descriptions refer to different parts: behind the lens is the jellylike vitreous humor, the light-detecting cells are the rods and cones in the retina, and the tough white outer coat is the sclera. So the term describes the hole that lets light into the eye.
Question
3
Which statement describes reflection?
Explanation:
Reflection is when light hits a surface and bounces off instead of being absorbed or passing through. When light meets a smooth surface, the direction it comes in from (the angle of incidence) is equal to the direction it leaves (the angle of reflection), so the light changes direction in a predictable way. The statement that light can be reflected captures what reflection is. The other ideas don’t describe reflection: light can be absorbed, light does interact with surfaces, and most walls are opaque and don’t let light pass through.
Question
4
Which statement defines the angle of incidence in reflection?
Explanation:
The angle of incidence is the angle formed between the incoming light ray and the normal line to the surface at the point where the light hits. The normal is a line drawn perpendicular to the surface. This way of measuring uses the normal because the law of reflection states that the angle of incidence equals the angle of reflection, and both are measured with respect to the normal. The angle between the incident ray and the surface would be the complement of the incidence angle, not the standard measure. The angle between the reflected ray and the normal is the angle of reflection, not the incidence. So the statement describing the angle between the incoming ray and the normal is the correct one.
Question
5
In a refracting telescope, what is the objective lens?
Explanation:
The main idea is that the objective lens in a refracting telescope must collect light from a distant object and form a real image by converging the incoming light. A convex lens does this because its outward-curving surfaces bend parallel rays toward each other, causing them to meet at the focal point and create a real image at the focal plane. That image is then magnified by the eyepiece for the observer. If you used a concave lens, the rays would diverge instead of converging, so a real image wouldn’t form in the expected location. A plano-convex lens is still a convex lens with one flat side, so it can converge light, but the essential function of the objective is to collect and focus light, which a convex lens does. A concave mirror isn’t a lens at all and belongs to a different telescope type.
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Alberta Grade 8 Science – Light and Optical Systems Practice Test
This practice set contains 10 questions from the matching question bank and focuses on light, lens, describes, pupil, and reflection. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.
This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.
Frequently Asked Questions
This quiz contains a total of 10 practice questions carefully selected to test your knowledge on this subject.
Yes, you will have exactly 0 minutes to complete the exam. A countdown timer will be visible once you start.
Yes, you can retake this practice test as many times as you need. The questions and options may be randomized on subsequent attempts to ensure comprehensive learning.
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