แบบทดสอบรายวิชาวิทยาศาสตร์(ว32101) ชั้นมัธยมศึกษาปีที่ 2

The explanation for the correct answer is that the image seen through the magnifying glass appears to be virtual, upright, and larger in size compared to the actual object. This is because the magnifying glass uses convex lenses that converge the light rays, creating a magnified and enlarged image. The image is formed on the same side as the object, which means it is in front of the lens and appears to be on the same side as the object. Therefore, the statement is correct.

The given statement is correct. When an object is placed far away from a convex mirror, a virtual, erect, and diminished image is formed. This image is located behind the mirror and is smaller in size compared to the actual object. Therefore, the statement accurately describes the formation of a small and real image at the focal point of a convex mirror.

The explanation for the correct answer is that the statement correctly identifies that the image seen through a mirror or lens is a virtual image, which is a replica or an illusion of the real image. The statement also states that the image seen directly is the real image, which refers to the actual object or scene being observed. Therefore, the answer "ถูก" (correct) is appropriate.

คนสายตาสั้นจะต้องสวมแว่นที่มีเลนส์เว้า เพราะเลนส์เว้าจะช่วยให้คนสายตาสั้นเห็นภาพที่อยู่ไกลได้ชัดเจนขึ้น และช่วยปรับสายตาให้เห็นได้ชัดเจนในระยะที่ใกล้

The correct answer is "ถูก" (correct). The explanation for this is that the statement is saying "The mirror that provides a true image is a rearview mirror." This implies that the rearview mirror is the type of mirror that accurately reflects the image of what is behind the viewer.

If the length of the focal length is negative, it indicates that the type of glass is convex.

The statement is correct because a microscope is a device that uses lenses to magnify and produce an enlarged image of small objects or details that are not visible to the naked eye. Therefore, it can be inferred that a microscope can create virtual, upside-down, and magnified images.

This answer is correct because it states that the statement is false. The statement compares a convex lens to a concave mirror, which is incorrect. A convex lens and a concave mirror have different properties and do not produce the same type of image. Therefore, the statement is incorrect.

The answer suggests that the path of light can be refracted or bent when it passes through a medium, such as water. This is supported by the statement that the water is transparent, indicating that light can pass through it. Therefore, it can be concluded that the path of light can be bent when it passes through water.

The correct answer is "การหักเหของแสง" (refraction of light). When light passes through a transparent medium, such as glass or water, it changes direction due to the change in speed. This bending of light is known as refraction. It occurs because light travels at different speeds in different materials. The phenomenon of refraction is responsible for various optical effects, such as the bending of a pencil in a glass of water or the splitting of white light into different colors in a prism.

เลนส์นูนและกระจกเว้าเป็นอุปกรณ์ที่ใช้ในการทำให้ภาพเป็นจริงได้ ซึ่งเลนส์นูนใช้ในการจับภาพและโฟกัสภาพให้ชัดเจน ส่วนกระจกเว้าใช้ในการส่งภาพที่จับได้จากเลนส์นูนไปยังตาผู้มองเห็น ทำให้เกิดภาพที่มีความคมชัดและเป็นจริงได้

The statement is incorrect because in order to obtain a real image of the same size as the object, the object should be placed at the focal point of the concave mirror.

The statement is saying that a concave mirror only produces a smaller image. This is correct as concave mirrors have a curved inward surface that causes light rays to converge and create a smaller image compared to the actual object.

When the coin is placed at the bottom of the glass, it is not visible when viewed from the side because of the phenomenon of light refraction. However, when water is poured into the glass, the light rays bend as they pass from the air to the water, causing the coin to become visible. This is due to the refraction of light.

The given statement states that if an object is placed in front of a certain lens and a virtual image is formed, then it indicates that the lens is a diverging lens. This explanation suggests that the statement is incorrect because a virtual image can be formed by both converging and diverging lenses.

เมื่อแสงจากดวงอาทิตย์ส่องผ่านปริซึม แสงจะถูกหักเหของเมื่อเจอกับขอบของปริซึม ซึ่งทำให้แสงเปลี่ยนทิศทาง และเกิดปรากฏการณ์แสงสีต่าง ๆ ซึ่งเรียกว่าการหักเหของแสง

กล้องรูเข็มไม่ได้อาศัยหลักการสะท้อนหรือหักเหของแสง เพราะกล้องรูเข็มใช้หลักการการเพิ่มขนาดของรูรับแสงเพื่อให้ภาพที่เกิดขึ้นในกล้องมีความสว่างมากขึ้น โดยไม่มีการสะท้อนหรือหักเหมือนกับกล้องอื่นๆ

When light passes from air to water, it undergoes refraction. Refraction is the bending of light as it passes through different mediums with different densities. In this case, since water is denser than air, the light will bend towards the normal, which is an imaginary line perpendicular to the surface of the water. Therefore, the correct answer is that the light will bend towards the normal or "เบนเข้าหาเส้นปกติ" in Thai.

When we are underwater and look at our friends on the shore, they will appear to be lower than their actual position. This is due to the refraction of light as it passes from water to air, causing the light rays to bend. As a result, the image of our friends is displaced and appears lower than their actual position. Therefore, the correct answer is "เห็นอยู่ต่ำกว่าตัวจริง" (appear lower than their actual position).

We derive the most benefit from the refraction of light in the creation of optical illusions. Optical illusions are created by manipulating the way light enters our eyes, which can trick our brains into perceiving something that is not actually there. This can be seen in various visual tricks, such as the bending of lines or the appearance of movement in a still image. By understanding how light behaves and using this knowledge to create optical illusions, we can create captivating and intriguing visual experiences.