Kuis Cahaya Dan Alat Optik 1

1. Salah satu cacat mata yang penderitanya tidak mampu melihat garis-garis horizontal dan vertikal secara simultan dinamakan astigmatisma. Penderita astigmatisma dapat ditolong dengan menggunakan lensa silindris

True

False

Astigmatism is a visual condition where the individual is unable to see horizontal and vertical lines simultaneously. This can be corrected by using cylindrical lenses. Therefore, the statement "Penderita astigmatisma dapat ditolong dengan menggunakan lensa silindris" is true.

Explanation

Astigmatism is a visual condition where the individual is unable to see horizontal and vertical lines simultaneously. This can be corrected by using cylindrical lenses. Therefore, the statement "Penderita astigmatisma dapat ditolong dengan menggunakan lensa silindris" is true.

2. Seorang penderita rabun dekat dengan titik dekat 50 cm ingin membaca pada jarak baca normal. Jenis lensa kacamata yang harus digunakan dan jarak fokusnya adalah . . . .

cembung, fokus 50 cm

cekung, fokus 30 cm

cembung, fokus 52cm

rangkap, fokus 33,3 cm

The correct answer is cembung, fokus 50 cm. This is because a person with nearsightedness (rabun dekat) needs a convex lens to correct their vision. A convex lens helps to diverge the light rays before they enter the eye, allowing the person to see objects at a normal reading distance. The focal length of the lens should be equal to the distance at which the person wants to read, which in this case is 50 cm.

Explanation

The correct answer is cembung, fokus 50 cm. This is because a person with nearsightedness (rabun dekat) needs a convex lens to correct their vision. A convex lens helps to diverge the light rays before they enter the eye, allowing the person to see objects at a normal reading distance. The focal length of the lens should be equal to the distance at which the person wants to read, which in this case is 50 cm.

3. Seekor ikan yang berada dalam kolam terlihat lebih dekat dibandingkan dengan keadaan sebenarnya. Hal ini disebabkan sinar yang keluar dari air ....

dibiaskan mendekati garis normal

dibiaskan menjauhi garis normal

dipantulkan menjauhi garis normal

tidak mengalami pembiasan

Sinar yang keluar dari air ketika melewati permukaan air-udara mengalami pembiasan. Pembiasan ini membuat objek yang berada di dalam air, seperti seekor ikan dalam kolam, terlihat lebih dekat dari keadaan sebenarnya ketika diamati dari luar air. Oleh karena itu, sinar yang keluar dari air dibiaskan mendekati garis normal.

Explanation

Sinar yang keluar dari air ketika melewati permukaan air-udara mengalami pembiasan. Pembiasan ini membuat objek yang berada di dalam air, seperti seekor ikan dalam kolam, terlihat lebih dekat dari keadaan sebenarnya ketika diamati dari luar air. Oleh karena itu, sinar yang keluar dari air dibiaskan mendekati garis normal.

4. Titik jauh penglihatan seseorang 100 cm di muka mata. Agar bisa melihat benda-benda yang sangat jauh orang ini memerlukan kacamata dengan lensa yang kuat lensanya . . . .

0,1 dioptri

-1 dioptri

0,3 dioptri

3 dioptri

The person's far point of vision is 100 cm, which means they can see objects clearly up to a distance of 100 cm without any visual aid. To see objects that are farther away, they would need glasses with a lens that can provide additional focusing power. Since the answer is -1 dioptri, it suggests that the person needs a lens with a negative power to correct their vision and enable them to see distant objects clearly.

Explanation

The person's far point of vision is 100 cm, which means they can see objects clearly up to a distance of 100 cm without any visual aid. To see objects that are farther away, they would need glasses with a lens that can provide additional focusing power. Since the answer is -1 dioptri, it suggests that the person needs a lens with a negative power to correct their vision and enable them to see distant objects clearly.

5. Sifat bayangan yang dibentuk oleh cermin datar adalah maya berlawanan arah, tegak, sama besar

True

False

The statement is true because when an object is placed in front of a flat mirror, the image formed is virtual, upright, and of the same size as the object. The image appears to be behind the mirror, hence it is said to be "opposite" or "reversed" in direction. Additionally, the image is erect or upright, meaning it is not flipped or inverted.

Explanation

The statement is true because when an object is placed in front of a flat mirror, the image formed is virtual, upright, and of the same size as the object. The image appears to be behind the mirror, hence it is said to be "opposite" or "reversed" in direction. Additionally, the image is erect or upright, meaning it is not flipped or inverted.

6. Salah satu cacat mata yang disebabkan oleh berkurangnya daya akomodasi seseorang karena usia lanjut. Penderita tidak dapat melihat benda yang terlalu jauh dan terlalu dekat dengan jelas. Cacat mata yang dimaksud adalah rabun jauh

True

False

The given statement is false. The explanation states that the person affected by this eye defect cannot see objects that are too far or too close clearly. This condition is called farsightedness, not farsightedness. Therefore, the correct answer is false.

Explanation

The given statement is false. The explanation states that the person affected by this eye defect cannot see objects that are too far or too close clearly. This condition is called farsightedness, not farsightedness. Therefore, the correct answer is false.

7. Match the following

Choice 1

Choice 2

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Kuis Cahaya Dan ALAT Optik 1